Choose the function that the graph represents.
Click on the correct answer.
y = f(x) = log(1/9)x
y = f(x) = loggx
y = f(x) = x9
Answers
Answer:
[tex]y=log_{9} (x)[/tex] (the middle choice)
Step-by-step explanation:
Key Concepts
Concept 1. Exponential vs logarithm
Concept 2. Logarithm rules
Concept 1. Exponential vs logarithm
The first two choices are logarithmic functions whereas the last function is an exponential function. The graph cannot be that of an exponential function because exponential functions cannot cross the x-axis (an asymptote) unless a shift transformation is applied (which would look like adding or subtracting a constant number at the end of the equation.
A second way to verify is to simply input 2 into the function. The number 2 raised to the 9 power is 2*2*2*2*2*2*2*2*2=512, but the graph clearly does not have a height of 512 when the input is 2. Therefore, the correct answer cannot be the last choice.
Concept 2. Logarithm rules
One important rule for logarithms is that a number input into logarithm that matches the base of the logarithm will yield 1 as a result. In other words:
For all real numbers b, such that b is positive and not equal to 1, [tex]log_{b}(b)=1[/tex]
Observe that for the first option, this means that [tex]log_{\frac{1}{9}}(\frac{1}{9})=1[/tex]. However, for an input of 1/9, the output is still below the x-axis -- a negative output -- clearly not 1.
Observe that for the second option, this means that [tex]log_{9}(9)=1[/tex], and that for an input of 9, the output on the graph is at a height of 1.
Therefore, the correct function for this question must be the middle option.
Related Questions
Next Write the equation for a sphere centered at the point ( - 8,8, -9) and the point (9,-8, -1) is on the sphere. - Add Work Submit Question
Answers
The equation for the sphere centered at (-8, 8, -9) with radius [tex]\sqrt(689)[/tex] and passing through the point (9, -8, -1).
How to the equation for a sphere centered at the point?The equation for a sphere with center (a, b, c) and radius r is given by:
[tex](x - a)^2 + (y - b)^2 + (z - c)^2 = r^2[/tex]
In this case, the center of the sphere is (-8, 8, -9) and the point (9, -8, -1) is on the sphere.
Let's plug these values into the equation and solve for the radius:
[tex](9 - (-8))^2 + (-8 - 8)^2 + (-1 - (-9))^2 = r^2[/tex]
[tex](17)^2 + (-16)^2 + (8)^2 = r^2[/tex]
[tex]r^2 = 689[/tex]
Now that we have the center and the radius, we can write the equation of the sphere as:
[tex](x + 8)^2 + (y - 8)^2 + (z + 9)^2 = 689[/tex]
This is the equation for the sphere centered at (-8, 8, -9) with radius [tex]\sqrt(689)[/tex] and passing through the point (9, -8, -1).
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Directed Line Segments Given the points A(-1, 2) and B(7. 8), find the coordinates of the point Pon directed line segment AB that partitions AB in the ratio 1:3.
Answers
The coordinates of point P on the directed line segment AB, which divides AB in the ratio 1:3, are (5, 6.5).
To find the coordinates of the point P on the directed line segment AB that partitions AB in the ratio 1:3, we can use the concept of section formula.
Let's assume the coordinates of point P are (x, y). According to the section formula, the coordinates of P can be calculated as follows:
x = (3x2 + 1x1) / (3+1) = (37 + 1(-1)) / 4 = (21 - 1) / 4 = 20/4 = 5
y = (3y2 + 1y1) / (3+1) = (38 + 12) / 4 = (24 + 2) / 4 = 26/4 = 13/2 = 6.5
Therefore, the coordinates of point P on the directed line segment AB, which divides AB in the ratio 1:3, are (5, 6.5).
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Determine the equation of the circle graphed below.
Answers
The equation of the circle graphed below is (x - 1)² + (y - 1)² = 4.
To determine the equation of a circle, we need to know the coordinates of its center and the radius. The general equation of a circle with center (h, k) and radius r is given by:
(x - h)² + (y - k)² = r²
where (x,y) are the coordinates of any point on the circle. The equation shows that the distance between any point (x,y) on the circle and the center (h,k) is always equal to the radius r.
To determine the equation of the circle graphed below, we need to identify the coordinates of its center and the radius. One way to do this is to use the distance formula between two points. We can choose any two points on the circle and use their coordinates to find the distance between them, which is equal to the diameter of the circle. Then, we can divide the diameter by 2 to find the radius.
To find the radius, we can choose any point on the circle and use the distance formula to find the distance between that point and the center. We can use the point (5,1), which is on the right side of the circle. The distance between (5,1) and (1,1) is 4 units, which means that the radius is 2 units.
Substituting the values of (h,k) and r in the general equation of the circle, we get:
(x - 1)² + (y - 1)² = 4
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Question below, please help! this is part of my grade.. (30 points)
Answers
Answer:
y = 1 + 2√7 or y = 1 - 2√7
Step-by-step explanation:
To complete the square, you need to add and subtract the square of half of the coefficient of the y term.
First, you can factor out a 1 from the y^2 - 2y term:
y^2 - 2y - 27 = 0
y^2 - 2y = 27
Next, take half of the coefficient of the y term (-2/2 = -1) and square it (1):
y^2 - 2y + 1 - 1 = 27
The "+1 -1" doesn't change the value of the equation, it's just a way to add 0 to the equation so we can complete the square.
Now you can rewrite the left side as a perfect square:
(y - 1)^2 - 28 = 0
Add 28 to both sides:
(y - 1)^2 = 28
Take the square root of both sides (remembering to include both positive and negative square roots):
y - 1 = ±√28
y = 1 ± 2√7
So the solutions are:
y = 1 + 2√7
y = 1 - 2√7
Answer: y=± 2√7+1
6.29
Step-by-step explanation: Use the formula
(b/2)^2 in order to create a new term. Solve for y by using this term to complete the square.
Of the money that was paid to a transportation company, 60\%60% went towards wages and 80\%80% of what was left went towards supplies.
If there was \$ 400$400 left after those two expenses, what was the original amount paid?
Amount paid = $
Answers
Answer is original amount paid to the transportation company was $800.
Let's work backwards from the final amount of $400 to find the original amount paid to the transportation company.
First, we know that percentage given is 80% of what was left after wages went towards supplies. So, if $400 was left after wages were paid, then:
0.8(400) = $320 went towards supplies.
Next, we know that 60% of the original amount went towards wages. So, if $320 went towards supplies, then the remaining amount that went towards wages was:
0.4(original amount) = $320
Solving for the original amount:
Original amount = $320 / 0.4 = $800
Therefore, the original amount paid to the transportation company was $800.
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the correct answer is supposedly 3
Answers
Answer: I agree the answer is 3
Step-by-step explanation:
Brainliest pls:)
f(x)=-x^(2)-8x+19
1.whats the functions minimum value?
2.where does the minimum value occur?
Answers
The minimum value of the function is -13 and the minimum value of the function occurs at the point (4, -13).
The function F(x) is a quadratic function with a negative coefficient of the squared term.
Therefore, the function has a maximum value.
To find the maximum value, we need to find the vertex of the parabola.
The x-coordinate of the vertex is given by x = -b/2a, where a and b are the coefficients of the x² and x terms respectively.
In this case, a = -1 and b = -8, so x = -(-8)/(2(-1)) = 4.
To find the minimum value, we substitute this x-value into the function to get F(4) = -(4²) - 8(4) + 19 = -13.
Therefore, the minimum value of the function is -13.
We found in part (1) that the x-coordinate of the vertex is x = 4.
To find the y-coordinate, we substitute this x-value into the function to get F(4) = -13.
Therefore, the minimum value of the function occurs at the point (4, -13).
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A car is purchased for $35,000. The owner finances the car at an interest rate of 4.6%, continuously compounded, for 6 years. What is the monthly payment on the car? Group of answer choices $640.62 $46,124.68 $35,046.00 $743.95
Answers
The monthly payment on the car is approximately $640.62. The correct option is A
To solve this problemThe formula for the monthly payment on a continuously compounded loan can be expressed as:
P = (r * A) / (1 - (1 + r)^(-n))
Where
P is the monthly payment r is the yearly interest rateA is the principal (i.e., the original amount borrowed) n is the number of payments (i.e., the number of years multiplied by 12)r is the annual interest rate (stated as a decimal and constantly compounded)Plugging in the given values, we get:
P = (0.046 * 35000) / (1 - (1 + 0.046/12)^(-6*12))
P ≈ $640.62
Therefore, the monthly payment on the car is approximately $640.62.
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At the neighborhood grocery, 5 pounds of chicken thighs cost $23.75. Riley spent $15.96 on chicken thighs. How many pounds of chicken thighs did she buy, to the nearest hundredth of a pound? 2
Answers
Using the given information, Riley bought 3.36 pounds of chicken thighs
Calculating the pounds of chicken boughtFrom the question, we are to calculate the number of pounds of chicken thighs that Riley bought
We can use proportionality to find how many pounds of chicken thighs Riley bought.
If 5 pounds of chicken thighs cost $23.75, then we can write the following proportion:
Cost/Weight = $23.75/5 lb
We can use this proportion to find the cost per pound of chicken thighs:
That is,
Cost/Weight = $23.75/5 lb = $4.75/lb
Now we can use this rate to find how many pounds of chicken thighs Riley bought:
Cost of chicken thighs bought = $15.96
Weight of chicken thighs = Cost of chicken thighs / Cost per pound of chicken thighs
Weight of chicken thighs bought = $15.96 / $4.75/lb ≈ 3.36 lb
Hence, Riley bought 3.36 pounds of chicken thighs.
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A rectangular prism with a square base has a height of 17. 2 cm and a volume of 24. 768 cm3. What is the side length of its base?
Answers
The side length of the base of the rectangular prism is approximately 1.2 cm.
What is rectangular prism?The top, bottom, and lateral faces of a rectangular prism are all rectangles, and all the pairings of the opposing faces are congruent. A rectangular prism is a three-dimensional structure with six faces.
Let's denote the side length of the base of the rectangular prism as "x" cm.
We know that the volume of a rectangular prism is given by the formula:
Volume = Base Area x Height
In this case, the base is a square, so its area is given by:
Base Area = x²
We are given that the volume is 24.768 cm³ and the height is 17.2 cm.
Therefore, we can write the equation:
24.768 = x² * 17.2
To find the value of x, we can rearrange the equation:
x² = 24.768 / 17.2
x² = 1.4376
Taking the square root of both sides, we get:
x = √1.4376
x ≈ 1.2
Therefore, the side length of the base of the rectangular prism is approximately 1.2 cm.
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Translate each problem into a mathematical equation.
1. The price of 32'' LED television is P15,500 less than twice the price of the
old model. If it cost P29,078. 00 to buy a new 32'' LED television, what is
the price of the old model?
2. The perimeter of the rectangle is 96 when the length of a rectangle is
twice the width. What are the dimensions of therectangle?
Answers
The price of the old model is given by $22.289 and dimensions of the rectangle by 16units and 32 units.
Two dimensions make up a rectangle: the length and, perpendicular to that, the breadth. A triangle's or an oval's interior likewise has two dimensions. Despite the fact that we don't consider them to have "length" or "height," they do span a territory that is expansive in more than one way.
A circle can be measured in any direction. Why do we just consider it to be two dimensional? Because only one direction—the direction perpendicular to the first measurement—can be used to make a second measurement, for a total of two directions.
Let us assume that, price of the old model is Px .
so,
→ Price of 32" LED television = P(2x - 15.500)
A/q,
→ (2x - 15.500) = 29.078
→ 2x = 29.078 + 15.500
→ 2x = 44.578
→ x = $22.289
Therefore, price of the old model is $22.289.
Let us assume that, width of the rectangle is x unit.
so,
→ Length = twice of width = 2x = 2x unit .
then,
→ Perimeter = 2(Length + width)
A/q,
→ 2(2x + x) = 96
→ 3x = 48
→ x = 16 unit .
therefore,
Width of rectangle = x = 16 units .
Length of rectangle = 2x = 32 units.
Hence, the dimensions of the rectangle are 16units and 32 units.
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The price of the old televison is P22,289
The dimensions of the rectangle are 16 and 32
Translating word problems to equationsWe have to read the problem carefully so as to be able to know how to translate the problem effectively and that is what we are going to do below.
We know that;
Let the price of the old 32'' LED television be x
Now;
29,078. 00 = 2x - 15,500
29,078. 00 + 15,500 = 2x
x = 29,078. 00 + 15,500 /2
x = P22,289
ii) Given that;
l = 2w
Perimeter = 2(l +w)
P = 2(2w + w)
P = 2(3w)
P = 6w
w = 96/6
w = 16
Then l = 2(w) = 32
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A manufacturer makes sneakers in six colors, available in four styles, with three choices of
fabrics. how many unique types of sneakers does the manufacturer make?
Answers
To find the number of unique types of sneakers, we need to multiply the number of options for each characteristic:
Number of colors: 6
Number of styles: 4
Number of fabrics: 3
Total number of unique types of sneakers = 6 x 4 x 3 = 72
Therefore, the manufacturer makes 72 unique types of sneakers.
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Amozon reduced the price of a item from $80 to $68.what is the percent of change on the item.
Answers
The percent of change on the item 15%
What is the percent of change on the item?the percent of change in price of the item can be expressed as:
percent of change = ( | new value - old value | / old value) × 100%
Where the vertical bars indicate absolute value.
Given that; the old price was $80 and the new price is $68. So, we can plug these values into the formula:
percent of change = ( | new value - old value | / old value) × 100%
percent of change = ( | 68 - 80 | / 80) × 100%
percent of change = ( | -12 | / 80) × 100%
percent of change = ( 12 / 80) × 100%
percent of change = ( 0.15 ) × 100%
percent of change = 15%
Therefore, Amazon reduced the price of the item by 15%.
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Find the area of the shaded region. Round to final answer to the nearest tenth for this problem.
Answers
Answer:
(1/6)π(4^2) - (1/2)(2√3)(4)
= 8π/3 - 4√3 = about 1.4
what is the side length of a cube that has a volume of 64 square inches
Answers
Answer:
side length of cube=4inch
Step-by-step explanation:
volume of cube(V)=64sqinch
length of side(l)=?
Now,
volume of cube(V)=l^3
64=l^3
∛64=l
4=l
l=4inch
A cylindrical swimming pool has a diameter of 12 feet and a height of 4 feet. How many gallons of water can the pool contain? Round your answer to the nearest whole number. (1 ft3 ≈ 7. 5 gal)
Answers
The number of gallons of water the pool can contain is approximately 3393 gallons.
To find the amount of water in gallons the pool can contain, we must find the volume of the cylindrical swimming pool, you can use the formula:
Volume = π * r² * h
Where r is the radius (half the diameter), and h is the height.
In this case, r = 12 feet / 2 = 6 feet, and h = 4 feet.
Volume = π * (6 ft)² * 4 ft ≈ 452.39 ft³
To convert cubic feet to gallons, use the given conversion factor (1 ft³ ≈ 7.5 gal).
Volume ≈ 452.39 ft³ * 7.5 gal/ft³ ≈ 3392.93 gal
Rounding to the nearest whole number, the pool can contain approximately 3393 gallons of water.
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Probability and statistics
The median of a random variable X to a continuous probability distribution is a
constant m such that P(X ≤m) = 1/2
Find the median of a random variable having pdf f(x) = 3x−4 for x ≥1 (and 0
otherwise).
Answers
The median of the random variable X with pdf f(x) = 3x−4 for x ≥1 (and 0 is approximately 1.482.
To find the median of a random variable with the given probability density function (pdf) f(x) = 3x - 4 for x ≥ 1 (and 0 otherwise), we need to solve for the constant m such that the cumulative probability P(X ≤ m) = 1/2.
First, we find the cumulative distribution function (CDF) by integrating the pdf:
F(x) = ∫(3x - 4) dx, where the limits of integration are from 1 to x.
F(x) = [(3/2)x² - 4x] evaluated from 1 to x.
Now, set the CDF equal to 1/2 to find the median:
1/2 = [(3/2)m² - 4m] - [(3/2)(1)² - 4(1)]
1/2 = (3/2)m² - 4m - (1/2)
1 = 3m² - 8m
0 = 3m² - 8m - 1
To find the value of m, we solve the quadratic equation above. Unfortunately, it cannot be factored easily, so we use the quadratic formula:
m = (-b ± √(b² - 4ac)) / 2a
In this case, a = 3, b = -8, and c = -1. Plugging in these values:
m ≈ (8 ± √(64 + 12)) / 6 ≈ 1.482
Since the median must be greater than or equal to 1, we take the positive root of the equation: m ≈ 1.482. Thus, the median of the random variable X with the given pdf is approximately 1.482.
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Use the compound interest table on p. 28 to complete each row below.
Annual
Interest Compounded
Rate
$900.00 5.50%
$640.00 6.00%
$1,340.00 5.00%
$6,231.40 5.75%
$3,871.67 12.00%
$9,000.00 18.00%
Quarterly a.
a.
Semiannually a.
Quarterly
Semiannually a.
Monthly a.
Monthly
a.
Rate per
Period
Total
Time
Total
Number of
Periods
2 years b.
4 years b.
3
years b.
years b.
4 years b.
2 years b.
C.
C.
C.
C.
C.
C.
Amount
Compound
Interest
d.
d.
d.
d.
d.
d.
Answers
Answer:To complete the table using the compound interest table on page 28, we can use the following steps:
Determine the rate per period based on the given annual interest rate and compounding frequency.
Calculate the total number of periods based on the total time and compounding frequency.
Use the compound interest table to find the factor for the rate per period and the total number of periods.
Multiply the factor by the initial amount to find the amount after compound interest.
Subtract the initial amount from the amount after compound interest to find the compound interest.
Using these steps, we can complete the table as follows:
Annual
Interest Compounded
Rate
$900.00 5.50% Quarterly 1.375% 2 years 8
$640.00 6.00% Semiannually 3.00% 4 years 8
$1,340.00 5.00% Quarterly 1.25% 3 years 12
$6,231.40 5.75% Semiannually 2.875% 4 years 8
$3,871.67 12.00% Monthly 1.000% 4 years 48
$9,000.00 18.00% Monthly 1.500% 2 years 24
Quarterly 0.016%
Semiannually 0.033%
Monthly 0.058%
Monthly 0.058%
Monthly 1.500%
Quarterly 0.450%
Total
Time
2 years
4 years
3 years
4 years
4 years
2 years
Total
Number of
Periods
8
8
12
8
48
24
C.
$1,042.36
$812.65
$1,519.39
$7,305.10
$8,980.54
$20,790.56
Amount
Compound
Interest
d.
$42.36
$172.65
$119.39
$3,074.70
$4,109.87
$11,790.56
Note: The values in row C represent the amount after compound interest, and the values in row d represent the compound interest. The quarterly, semiannually, and monthly rates are rounded to three decimal places for convenience.
Step-by-step explanation:
The distance around a neighborhood is 6 miles. When Sam measured it with an
odometer, the distance was 5. 52 miles. What is the percent of error of the
measurement?
Answers
The percent of error in the measurement is 8%. This means that the measured value of 5.52 miles is 8% less than the actual distance of 6 miles.
To find the percent of error, we need to calculate the difference between the measured value and the actual value, divide that by the actual value, and then multiply by 100 to convert to a percentage.
Actual distance around the neighborhood = 6 miles
Measured distance around the neighborhood = 5.52 miles
Difference = Actual distance - Measured distance
Difference = 6 miles - 5.52 miles
Difference = 0.48 miles
Percent of error = (|Difference| / Actual distance) x 100%
Percent of error = (|0.48| / 6) x 100%
Percent of error = 0.08 x 100%
Percent of error = 8%
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Mrs.lane makes a 22% commission on commercial advertising sales for the local newspaper plus $8.25/hr. working 40hrs/week. her average bi-weekly commercial sales are $5,625. how much would her average gross monthly income be?
Answers
Mrs. Lane's average gross monthly income would be $3,135.
How to find the income?To find the monthly income of Mrs. Lane's,
First, we need to find Mrs. Lane's commission for her bi-weekly commercial sales:
Commission = 22% of $5,625 = 0.22 x $5,625 = $1,237.50
Next, we need to find her hourly wage for a week:
Hourly wage = $8.25 x 40 = $330
Her gross bi-weekly income is the sum of her commission and hourly wage:
Gross bi-weekly income = Commission + Hourly wage
= $1,237.50 + $330
= $1,567.50
To find her gross monthly income, we can multiply her gross bi-weekly income by the number of bi-weekly pay periods in a month:
Gross monthly income = Gross bi-weekly income x Number of bi-weekly pay periods in a month
= $1,567.50 x 2
= $3,135
Therefore, Mrs. Lane's average gross monthly income would be $3,135.
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Joe started a tutoring job and earns $40 per week tutoring his classmates. He bought a new iPad to help with his tutoring job for $150. Write a linear equation that represents Joe's money, y, after x amount of weeks.
Answers
y = 40x - 150
where y is Joe's money after x amount of weeks.
A supermarket operator must decide whether to build a medium size supermarket or a large supermarket at a new location. Demand at the location can be either average or favourable with estimated probabilities to be 0. 35 and 0. 65 respectively. If demand is favorable, the store manager may choose to maintain the current size or to expand. The net present value of profits is $623,000 if the firm chooses not to expand. However, if the firm chooses to expand, there is a 75% chance that the net present value of the returns will be 330,000 and 25% chance the estimated net present value of profits will be $610,000. If a medium size supermarket is built and demand is average, there is no reason to expand and the net present value of the profits Is $600,000. However, if a large supermarket is built and the demand turns out to be average, the choice is to do nothing with a net present value of $100,000 or to stimulate demand through local advertising. The response to advertising can be either unfavorable with a probability of 0. 2 or faverable with a probability of 0. 8. If the response to advertising is unfavorable the net present value of the profit is ($20,000). However, if the response to advertising is favourable,then the net present vale of the profits in $320,000. Finally, if the large plant is built and the demand happens to be high the net present value of the profits is $650. 0. Draw a decision tree and determine the most appropriate decision for this company
Answers
The most appropriate decision for the company is to build a large supermarket and expand if demand turns out to be favorable.
Here is a decision tree for the given problem:
```
Build Medium
/ \
Average / \ Favorable
/ \
NPV = $600K Expand
/ \
NPV = $330K NPV = $610K
75% 25%
\ /
Favorable / Unfavorable
/
NPV = $623K
\
High
\
NPV = $650K
/
Stimulate / Not Stimulate
/ \
Favorable / Unfavorable
/ \
NPV = $320K NPV = -$20K
```
To determine the most appropriate decision, we will use the expected value approach. At each decision node, we will calculate the expected value of each decision option and choose the one with the highest expected value.
Starting from the top, the expected value of building a medium size supermarket is:
Expected value = (0.35 x $600K) + (0.65 x $623K) = $615,250
The expected value of building a large supermarket and not stimulating demand if it turns out to be average is:
Expected value = (0.35 x $100K) + (0.65 x $623K) = $403,250
The expected value of building a large supermarket and stimulating demand if it turns out to be average is:
Expected value = (0.35 x 0.2 x -$20K) + (0.35 x 0.8 x $320K) + (0.65 x $623K) = $394,850
The expected value of building a large supermarket and expanding if it turns out to be favorable is:
Expected value = (0.65 x 0.75 x $330K) + (0.65 x 0.25 x $610K) + (0.35 x $623K) = $473,125
The expected value of building a large supermarket if it turns out to be high is:
Expected value = $650K
Comparing all the expected values, we see that building a large supermarket and expanding if demand turns out to be favorable has the highest expected value of $473,125. Therefore, the most appropriate decision for the company is to build a large supermarket and expand if demand turns out to be favorable.
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A bag contains 5 red marbles, 6 blue marbles and 3 green marbles. If three marbles are drawn out of the bag, what is the exact probability that all three marbles drawn will be red?
Answers
Step-by-step explanation:
5 + 6 + 3 = 14 marbles 5 are red
1st marble red = 5 out of 14 = 5/14
now there are 13 marbles 4 are red
2nd marble red 4/13
and finally , 3rd marble red = 3/12
5/14 * 4/13 * 3/12 = 5/182 chance for three reds
A researcher surveyed 220 residents of a city about the number of hours they
spend watching news on television each day. The mean of the sample was
1. 8 with a standard deviation of 0. 35.
The researcher can be 95% confident that the mean number of hours all the
residents of the city are watching news on television is 1. 8 with what margin
of error?
Answers
The researcher can be 95% confident that the mean number of hours all the residents of the city are watching news on television is between 1.7538 and 1.8462 hours, with a margin of error of 0.0462 hours.
Based on the information provided, the researcher surveyed 220 residents of the city and found that the mean number of hours they spend watching news on television each day is 1.8, with a standard deviation of 0.35.
The researcher wants to know the margin of error at a 95% confidence level for the mean number of hours all residents of the city are watching news on television.
To calculate the margin of error, we need to use the formula:
Margin of error = Critical value x Standard error
The critical value for a 95% confidence level is 1.96, and the standard error can be calculated as:
Standard error = Standard deviation /square root of sample space
Substituting the values given:
Standard error = 0.35 / sqrt(220) = 0.0236
Therefore, the margin of error can be calculated as:
Margin of error = 1.96 x 0.0236 = 0.0462
So, the researcher can be 95% confident that the mean number of hours all the residents of the city are watching news on television is between 1.7538 and 1.8462 hours, with a margin of error of 0.0462 hours.
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If a scale dilates a two dimensional object by factors of 2/3 it means that?
Answers
If a scale dilates a two-dimensional object by a factor of 2/3, it means that the image of the object will be reduced by a factor of 2/3. In other words, the length and width of the image will be 2/3 of the length and width of the original object.
For instance, consider a rectangle with length L and width W. If we dilate this rectangle by a factor of 2/3, the new length and width of the rectangle will be (2/3)L and (2/3)W, respectively. The area of the new rectangle will be (2/3)L x (2/3)W = (4/9)LW, which is 4/9 of the original area. This means that the image is smaller than the original rectangle, and this type of dilation is called a reduction.
Dilations can be used in different applications of mathematics, such as geometry, trigonometry, and algebra. They are useful for changing the scale or size of an object in a proportional way, without altering its basic shape or characteristics.
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There were 7 students who scored 80% or lower in Period 3. How many students are there in Period 3?
Answers
The total students that were there in the third period is equal to 35
How to solve for the number of studentsLet the total students be x
we have x (1 - 80%) = 7
Such that we would have
x * 0.20 = 7
then 0.20x = 7
Divide through the equation above by 0.20
x = 7 / 0.20
x = 35
Therefore the total students that were there in thev third period is equal to 35
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purab bought twice the number of rose plants that he had in his lawn. however, he threw 3 plants as they turned bad. after he planted new plants, there were total 48 plants in the garden. how many plants he had in his lawn earlier?
Answers
Purab initially had 17 rose plants in his lawn before buying the new ones.
Purab initially had a certain number of rose plants in his lawn. He bought twice that number, but had to discard 3 plants as they turned bad
After planting the new ones, there were a total of 48 plants in the garden.
To determine how many plants he had earlier, let's use a variable x to represent the initial number of plants.
Purab bought 2x plants, and after removing the 3 bad plants, he had (2x - 3) good plants.
Adding these to the initial number of plants, the equation becomes:
x + (2x - 3) = 48
Combining like terms, we get:
3x - 3 = 48
Next, we add 3 to both sides:
3x = 51
Finally, we divide by 3: x = 17
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Find the area of the quadrilateral with the given coordinates A(-2, 4),
B(2, 1), C(-1, -3), D(-5, 0)
Answers
The quadrilateral formed by the vertices A(-2, 4), B(2, 1), C(-1, -3), and D(-5, 0) has an area of 21/2 square units.
What is the area of the quadrilateral with vertices A(-2, 4), B(2, 1), C(-1, -3), and D(-5, 0)?To find the area of the quadrilateral with the given coordinates A(-2, 4), B(2, 1), C(-1, -3), D(-5, 0), we can use the formula for the area of a quadrilateral in the coordinate plane:
Area = |(1/2)(x1y2 + x2y3 + x3y4 + x4y1 - x2y1 - x3y2 - x4y3 - x1y4)|
where (x1, y1), (x2, y2), (x3, y3), and (x4, y4) are the coordinates of the vertices of the quadrilateral.
Substituting the given coordinates, we get:
Area = |(1/2)(-2×1 + 2×(-3) + (-1)×0 + (-5)×4 - 2×4 - (-1)×1 - (-5)×(-3) - (-2)×0)|Area = |(-1 - 6 + 0 - (-20) - 8 + 1 + 15)|/2Area = 21/2Therefore, the area of the quadrilateral with the given coordinates is 21/2 square units.
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9. The value of a book is $258 and decreases at a rate of 8% per year. Find the value of the book after 11 years.
2 S5698
h $159. 05
c. $101. 38
d. S103. 11
Answers
The value of the book after 11 years is $101.38. Therefore, the correct option is C.
Find the value of the book after 11 years with an initial value of $258 and a decrease rate of 8% per year as follows.
1. Convert the percentage decrease to a decimal by dividing it by 100:
8% / 100 = 0.08
2. Subtract the decimal from 1 to represent the remaining value each year:
1 - 0.08 = 0.92
3. Raise the remaining value (0.92) to the power of the number of years (11):
0.92^11 ≈ 0.39197
4. Multiply the initial value of the book ($258) by the calculated remaining value (0.39197):
$258 × 0.39197 ≈ $101.07
Therefore, after 11 years, the value of the book is approximately $101.07, which is closest to option C, $101.38.
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The diagram below shows the side view of a ramp used to help load and unload a moving van. Which measurement is closest to the length of the ramp in feet?
Answers
Measurement is closest to the length of the ramp in feet is 33 feet
Let AB = 26 ft and BC = 19.5 ft
Let AC be the length of the ramp
Let's use the Pythagorean theorem to find the length of the ramp:
AC² = AB² + BC²
where AC is the hypotenuse (the unknown side), and AB and BC are the other two sides given.
Substituting the given values, we get:
AC² = 26² + 19.5²
AC² = 676 + 380.25
AC² = 1056.25
AC = [tex]\sqrt{1056.25}[/tex]
AC = 32.5
Rounding to the nearest feet
AC = 33
Therefore, the measurement closest to the length of the ramp in feet is 33 feet.
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