Answer:
x=8
Step-by-step explanation:
8 x 8 = 64
You can find this answer by using inverse operations.
64/8 = 8
To check your work, you can multiply...
8x8 = 64.
Hope this helps!
In January 2011 the rate of VAT increased from 17. 5% to 20%. Work out the difference in price of a car worth £15 000 + VAT
due to the increase in VAT
The difference in the price of a car worth £15,000 + VAT due to the increase in VAT is £250.
To calculate the difference in price due to the increase in VAT, first find the original amount of VAT on the car:
£15,000 x 17.5% = £2,625
Then find the new amount of VAT on the car:
£15,000 x 20% = £3,000
Finally, subtract the original amount of VAT from the new amount of VAT to find the difference:
£3,000 - £2,625 = £375
Therefore, the difference in the price of the car due to the increase in VAT is £375. However, this is only the difference in VAT. To find the total difference in price, you need to add the original price of the car:
£15,000 + £375 = £15,375
So the total difference in the price of the car due to the increase in VAT is £250 (£15,375 - £15,000).
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HELP! Georgie took 275 mg of medicine for her cold in the first hour she got home from work. In each subsequent hour, the amount of
medicine in her body is 91% of the amount from the previous hour.
What is the explicit rule for the amount of medicine remaining in her body in the nth hour and approximately how much medicine
would remain in the 8th hour?
Round to two decimal places.
Drag and drop the answers into the boxes to match the situation.
Explicit rule
Amount of medicine, in mg, during the 8th hour.
Answer:
here is the ananswer
Step-by-step explanation:
red go to red and black to black
10 points if someone gets it right
Tarzan loaded 4 trucks every 6 hours. At that rate, how long, in hours? will it take to load 6 trucks
larry had 1/3 of a submarine sandwich left over from a field trip he decided to share it with his 3 friends after school how much of the original sandwich did each person get
The answer is 1 / 9.
Larry had 1/3 of a Submarine sandwich left over from the excursion. If sharing with 3 friends, they must divide equally.
To do this, 1/3 of the sandwich should be divided into three equal parts. This can be written as:
1/3÷3
To simplify this expression, division can be converted to multiplication by multiplying the reciprocal of the divisor (3) by the dividend (1/3). That is:
1/3 ÷ 3 = 1/3 × 1/3
Multiplying the numerator and denominator gives:
1/3 × 1/3 = 1/9
Therefore, each person will get 1/9 of the original sandwich.
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Sally bought a bag of candies and sorted them by color. She had 9 red candies, 43 orange candies, and 14 yellow candies. How many total candies were in the bag?
She had 9 red candies, 43 orange candies, and 14 yellow candies. Therefore, there are total 66 candies.
In mathematics, total is the addition of a series of arbitrary numbers called addition or addition; the result is their sum. In addition to numbers, other types of values can be added: functions, vectors, matrices, polynomials, and in general, elements of any type of mathematical object on which a "+" operation is defined. The sum of infinite sequence is called sequence. They involve the concept of limits and are not considered in this article.
Given that:
9 red candies
43 orange candies and 14 yellow candies.
Therefore, there are = 9 + 43 + 14
= 66 candies.
Therefore, there are total 66 candies.
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someone says batman's iq is 192, and someone says lex luthor's iq is 225. assuming the average iq is 100 with a standard deviation of 15, how many sigma is batman's iq and luthor's iq?
Batman's IQ is 5.47 standard deviations above the mean, and Luthor's IQ is 8.33 standard deviations above the mean.
To find out how many standard deviations above the mean Batman's IQ of 192 and Luthor's IQ of 225 are, we first need to calculate the z-scores for each IQ.
The formula for the z-score is:
z = (x - μ) / σ
Where:
x is the value we want to standardize (Batman's or Luthor's IQ)
μ is the population mean IQ (100)
σ is the population standard deviation (15)
For Batman's IQ:
z = (192 - 100) / 15 = 5.47
For Luthor's IQ:
z = (225 - 100) / 15 = 8.33
Therefore, Batman's IQ is 5.47 standard deviations above the mean, and Luthor's IQ is 8.33 standard deviations above the mean.
Note that it is highly unlikely to have IQs this high in the general population, and these values are likely exaggerated for fictional characters.
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if the sun rotates once every 24.5 days at the equator, once every 24.8 days at latitude 15 degrees, and once every 34.3 days at the poles, what is the average number of days the sun takes to rotate once based on these three numbers?
Answer:
Step-by-step explanation:
To find the average number of days it takes for the sun to rotate once, we can add the three rotation periods and divide by 3:
Average rotation period = (24.5 + 24.8 + 34.3) / 3
Average rotation period = 83.6 / 3
Average rotation period = 27.87 days (rounded to two decimal places)
Therefore, the average number of days it takes for the sun to rotate once based on the given information is approximately 27.87 days.
WILL MARK AS BRAINLEIST!! PLEASE QUICKLY
Find a point e satisfying the conclusion of the Mean Value Theorem for the function f(x) = x^-8 on the interval [1, 5].
c =
The point c satisfying the conclusion of the Mean Value Theorem for the function f(x) = x^-8 on the interval [1, 5] is: c = 1.4697
How to solve mean value theorem?The conclusion of the Mean Value Theorem says that there is a number
c in the interval (1, 5) such that:
f'(c) = (f(5) - f(1))/(5 - 1)
We are given the function f(x) = x⁻⁸
Thus:
f(1) = 1⁻⁸ = 1
f(5) = 5⁻⁸ = 0.00000256
Thus:
f'(c) = (0.00000256 - 1)/4
= -0.25
f'(c) = -8x⁻⁹
Thus:
-8c⁻⁹ = -0.25
c⁻⁹ = 0.25/8
c⁻⁹ = 0.03125
c = 0.03125^(-1/9)
c = 1.4697
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a lottery offers one $1000 prize, one $500 prize, and five $100 prizes. one thousand tickets are sold at $3 each. find the expectation if a person buys one ticket.
the expectation of buying one ticket is $2
Expectation if a person buys one ticket A person is interested in buying a ticket for a lottery that offers one $1000 prize, one $500 prize, and five $100 prizes. One thousand tickets are sold at $3 each. The expected return is calculated using the following formula:
Expectation = (Probability of winning Prize 1 × Value of Prize 1) + (Probability of winning Prize 2 × Value of Prize 2) + (Probability of winning Prize 3 × Value of Prize 3)To determine the expectation, we must first determine the probability of winning each of the three prizes.
Since one thousand tickets are sold and only one person can win the first prize, the probability of winning the $1000 prize is 1/1000 or 0.001. Similarly, the probability of winning the $500 prize is 1/1000 or 0.001. Since five $100 prizes are available and only one person can win each prize, the probability of winning any one of the five $100 prizes is 5/1000 or 0.005.
Therefore, the expectation is calculated as follows: Expectation = (0.001 × $1000) + (0.001 × $500) + (0.005 × $100)Expectation = $1 + $0.50 + $0.50Expectation = $2Thus, the expectation of buying one ticket is $2. This means that the average value of a ticket is $2, and a person can expect to win $2 on average by purchasing a ticket. Since the cost of a ticket is $3, the expected return is less than the cost of the ticket, and therefore, it is not a good investment from a financial standpoint.
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an arch top window is being built whose bottom is a rectangle and the top is a semicircle. if there is 12 meters of framing amterials what is the width of the window that lets in the most light?
An arch top window is a window with a bottom in the form of a rectangle and the top in the form of a semicircle. The width of the window that lets in the most light is 6 meters.
The width of the window that lets in the most light is determined by the length of the base of the rectangle, which is equal to the diameter of the semicircle. The total length of the framing materials is 12 meters, so the base length of the rectangle should be 6 meters. Thus, the width of the window is 6 meters.
To explain further, the width of an arch top window is determined by the base of the rectangle that forms the bottom part of the window, and the top is a semicircle. To determine the width of the window that lets in the most light, the length of the base should be equal to the diameter of the semicircle. Since the total length of the framing materials is 12 meters, the base length of the rectangle should be 6 meters, and the width of the window should also be 6 meters.
This means that the width of the window that lets in the most light is 6 meters, as the length of the base of the rectangle is equal to the diameter of the semicircle.
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Identify the area of the polygon with vertices P(1,2), Q(1,4), R(-1,6), and S(-3,2).
A = 16 units²
A= 10 units²
A= 6 units²
A = 14 units²
The area of the polygon with vertices P(1,2), Q(1,4), R(-1,6), and S(-3,2) is given as 10 units. Option B
How to find the areaWe can find the area of the polygon with the given vertices by dividing it into triangles and adding their areas.
One way to divide the polygon into triangles is to draw a diagonal from vertex P to vertex R. This creates two triangles, PQR and PRS.
[tex]\frac{1 }{2} ((4 - 2) + (6--4) + (-2 - - 18) + (-6 - 2)[/tex]
= 1 / 2 ( 2 + `10 + 16 - 8)
= 1 / 2 ( 20
= 10
The area of the polygon is 10 units
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5
6
of the employees in a company are male.
7
8
of the male employees wear spectacles.
What fraction of the employees are males who wear spectacles?
Answer:
If 5/6 of the employees in a company are male, then the fraction of male employees in the company is:
5/6
If 7/8 of the male employees wear spectacles, then the fraction of male employees who wear spectacles is:
7/8
To find the fraction of employees who are males and wear spectacles, we need to multiply the fractions:
(5/6) x (7/8) = 35/48
Therefore, the fraction of employees who are males and wear spectacles is 35/48.
a lawn sprinkler sprays water 7 feet in every direction as it rotates. what is the area of the watered lawn? use 3.14 for π and be sure to put the correct unit of measure.
If a lawn sprinkler sprays water 7 feet in every direction as it rotates, the area of the watered lawn is approximately 153.94 square feet.
Assuming the sprinkler is placed at the center of the lawn, the area of the watered lawn can be found by calculating the area of a circle with a radius of 7 feet. The formula for the area of a circle is A = πr^2, where A is the area and r is the radius.
Plugging in the given value of the radius, we get:
A = π(7 feet)^2
A = 153.94 square feet (rounded to two decimal places)
It's important to include the correct unit of measure, which is square feet in this case, to avoid confusion.
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the air speed of a small airplane during the first 25 seconds of takeoff and flight can be modeled as
The air speed of a small airplane during the first 25 seconds of takeoff and flight can be modeled by Newton's Second Law of Motion.
According to Newton's Second Law of Motion, the rate of change of the airplane's momentum is equal to the sum of all the forces acting on the airplane. As the plane takes off and accelerates, the thrust of the engines acting in the forward direction causes the plane's momentum to increase. This increase in momentum results in an increase in air speed. The air resistance acting against the motion of the plane is another force that affects the plane's speed. As the plane accelerates, the air resistance increases, and the plane's speed decreases.
In summary, the air speed of a small airplane during the first 25 seconds of takeoff and flight can be modeled by Newton's Second Law of Motion, where the thrust of the engines and air resistance act as forces that influence the plane's air speed.
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please answer asap!!
Answer:
y = csc(3x)
Step-by-step explanation:
You want an equation for a cosecant curve with vertical asymptotes at multiples of π/3.
Horizontal compressionThe vertical asymptotes of the parent cosecant function are at multiples of π. Putting them at multiples of π/3 means compressing the graph horizontally by a factor of 3.
That compression means x will be replaced by 3x in the equation. You want ...
y = csc(3x)
the reliability of the source of information is one test to perform when assessing the reliability of group of answer choices premises. examples and illustrations. statistics. artifacts.
Artifacts are physical or digital objects which can be used to prove points.
Ultimately, determining the reliability of the source of information is essential to understanding the reliability of answer choices.
When assessing the reliability of a group of answer choices, it is important to consider the source of the information. This can be done by analyzing the origin of the information and its credibility.
Examples and illustrations are useful forms of evidence that can be used to support an argument. Statistics are numerical data that can be used to demonstrate the validity of a point.
Artifacts are physical or digital objects which can be used to prove a point. By evaluating the source of the information, and considering examples, illustrations, statistics, and artifacts, one can assess the reliability of a group of answer choices.
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a reasonable abstraction for a car includes: group of answer choices an engine number of miles driven driving car color
Answer:
Of the given options, "an engine" is the most reasonable abstraction for a car.
An engine is a fundamental component of a car that powers its movement, and it is present in almost all cars. The number of miles driven and the driving car color are characteristics of a specific car rather than abstractions of a car itself. For example, a car can still be considered a car even if it has not been driven any miles yet or if it has no color at all.
Therefore, an engine is a more reasonable abstraction for a car as it captures an essential feature of a car that is present in all cars.
The solution is, D. Driving, a reasonable abstraction for a car includes. Driving is an action or behavior associated with a car, as it involves operating or using the car to travel from one place to another. It is an essential aspect of the car's purpose and function.
Here, we have,
we know that,
An engine is a machine designed to convert fuel into mechanical energy that can be used to power other machines or devices. In the context of automobiles, an engine is the primary source of power that drives the vehicle. It typically operates by burning fuel in a combustion chamber to generate high-pressure gases that drive a piston, which in turn rotates a crankshaft that ultimately powers the car's wheels.
Car color and number of miles driven are characteristics or properties of a car, while an engine is a component that helps to power the car. Driving, on the other hand, is an action or behavior associated with a car, as it refers to the act of operating or using the car to travel from one place to another.
Therefore, driving is a reasonable abstraction for a car, as it captures an essential aspect of the car's purpose and function.
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a frozen food company uses a machine that packages okra in six ounce portions. a sample of 54 54 packages of okra has a variance of 0.44 0.44 . construct the 98% 98 % confidence interval to estimate the variance of the weights of the packages prepared by the machine. round your answers to two decimal places.
The confidence interval for variance is (0.29,0.58)
A family of continuous probability distributions is known as the chi-square (X2) distribution. They are frequently employed in hypothesis tests, such as the chi-square test of independence and the goodness of fit test.
The parameter k, which stands for the degrees of freedom, determines the shape of a chi-square distribution.
The distribution of real-world observations rarely has a chi-square shape. Chi-square distributions are primarily used for testing hypotheses rather than for modeling actual distributions.
Since we have given that the sample size n= 54,
variance = 0.44
we need to find a 98% confidence interval to estimate the variance.
So, we will use Chi-square distribution,
For this, we will find
df=n-1 = 54-1 = 53,
the interval would be,
[tex]\frac{(n-1)s^2}{X^2_{\alpha/2}} < \sigma^2 < \frac{(n-1)s^2}{X^2_{1-\alpha/2}}\\\\\alpha=1-0.98=0.02\\\\\alpha/2=0.02/2=0.01\\X^2_{0.01,53}=79.84\\Similarly\\\\1-\alpha/2=0.99\\\\X_{1-\alpha/2}^2,df=X^2_{0.99,53}=40.308\\\\So,\\\frac{53*0.44}{79.84} < \sigma^2 < \frac{53*0.44}{40.308}\\\\0.29 < \sigma^2 < 0.58[/tex]
Hence the confidence interval is (0.29,0.58)
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Consider the following hypothetical survey results of 18- to 34-year-olds in a certain country, in response to the question "Are you currently living with your family.
Yes No Totals
Men 106 141 247
Women 92 161 253
Totals 198 302 500
a. Develop the joint probability table for these data and use it to answer the following questions
b. What are the marginal probabilities?
c. What is the probability of living with family given you are an 18- to 34-year-old marn in the U. S. ?
d. What is the probability of living with family given you are an 18- to 34-year-old woman in the U. S. ?
e. What is the probability of an 18- to 34-year-old in the U. S. Living with family?
f. If, in the U. S. , 49. 4% of 18-to 34-year-olds are male, do you consider this a good representative sample? Why?
After considering the following hypothetical survey results of 18- to 34-year-olds in a certain country, in response to the question "Are you currently living with your family?" we get the following probabilities.
a. The joint probability table for the given data is:
Yes No Totals
Men 0.212 0.282 0.494
Women 0.184 0.322 0.506
Totals 0.396 0.604 1
b. The marginal probabilities for living with family and not living with family are:
Yes No
Men 0.212 0.282
Women 0.184 0.322
Totals 0.396 0.604
c. The probability of living with family given you are an 18- to 34-year-old man in the U.S. is 0.212/0.396 = 0.5354 or approximately 53.54%.
d. The probability of living with family given you are an 18- to 34-year-old woman in the U.S. is 0.184/0.506 = 0.3636 or approximately 36.36%.
e. The probability of an 18- to 34-year-old in the U.S. living with family is 0.396 or 39.6%.
f. We cannot determine whether the sample is representative solely based on the percentage of males in the survey.
A good representative sample should be randomly selected to accurately reflect the population being studied. The percentage of males in the sample is relevant only if it differs significantly from the percentage of males in the population being studied.
The joint probability table was developed for the survey results of 18- to 34-year-olds on living with family. Marginal probabilities were calculated and the probability of living with the family was found for both men and women. The overall probability of living with the family was also determined. It is unclear if the sample is representative without additional information.
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Martha has read 52 pages of her book. This is
20% of the book. How many pages does the
book have?
cylindrical container of paint is 3 cm across the top and about 7 cm high. how many cubic centimeters of paint can it hold?
The number of cubic centimeters of paint that will fit in the cylindrical container is:
66.36 cm³
How to find the volume of a cylindrical container?The volume of a cylinder can be determined by multiplying the area of the base by the height. It may be expressed using the formula:
V = πr²h
where π (pi) is approximately equal to 3.14, r is the radius, and h is the height.
You should also note that the radius of the cylinder is one-half of the diameter.
V = πr²h
Since the cylindrical container of paint has a diameter of 3 cm, its radius would be 1.5 cm. Furthermore, its height is around 7 cm. As a result, by substituting the given values into the formula, we may get the following result:
V = πr²hV = π(1.5)²(7)
V = 66.36 cm³
Therefore, the cylindrical container of paint can hold approximately 66.36 cubic centimeters of paint.
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exercise 1.2.21 a boy finds $1.05 in dimes, nickels, and pennies. if there are 17 coins in all, how many coins of each type can he have?
The boy can have 9 dimes, 0 nickels, and 8 pennies.
We have,
a boy finds $1.05 in dimes, nickels, and pennies.
Let's assume that the boy has x number of dimes, y number of nickels, and z number of pennies.
We know that the total value of these coins is $1.05, and there are 17 coins in total.
Now, let's convert the values into cents.
We have 10 cents for each dime, 5 cents for each nickel, and 1 cent for each penny.
Therefore, the equation we can set up is:
10x + 5y + z = 105
(since $1.05 is equal to 105 cents)
We also know that the total number of coins is 17, so:
x + y + z = 17
Now, we have a system of equations.
Let's solve it using a method called substitution.
From the second equation, we can express z in terms of x and y:
z = 17 - x - y
Substituting this value of z into the first equation, we get:
10x + 5y + (17 - x - y) = 105
Simplifying this equation, we get:
9x + 4y = 88
Now we have a new equation to work with.
We can rearrange it to solve for x:
x = (88 - 4y) / 9
To find the possible values for x and y, we can try different values of y and calculate the corresponding values for x.
Since the number of coins cannot be negative, we can start by setting y to 0 and calculate x:
x = (88 - 4(0)) / 9
x = 88 / 9
x ≈ 9.78
Since the number of coins must be a whole number, we can round x down to the nearest whole number, which gives us x = 9.
Now, let's substitute this value of x back into our second equation:
9 + y + z = 17
Simplifying this equation, we get:
y + z = 8
We can now try different values of y and calculate the corresponding values of z that satisfy this equation.
Let's start with y = 0:
0 + z = 8
z = 8
So, one possible solution is x = 9, y = 0, and z = 8.
This means the boy can have 9 dimes, 0 nickels, and 8 pennies.
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After forming a system of equations according to the given information
We find that the boy can have 5 pennies, 13 dimes, and 2 nickles.
Given that,
The boy finds a total of $1.05 in dimes, nickels, and pennies.
There are 17 coins in total.
Number of pennies = 5
Let "d" represent the number of dimes.
Let "n" represent the number of nickels.
Let "p" represent the number of pennies = 5
We know that,
1 $ = 100 cent
1 cent = 0.01$
According to the given information:
The system of equations be:
0.10d + 0.05n + 0.01 x 5 = 1.05 ......(i)
d + n + 2 = 17 .....(ii)
Proceeding with equation (i):
After simplifying:
0.10d + 0.05n = 1
Multiply 10 both sides
10d + 5n = 10 ....(iii)
Proceeding with equation (i):
After simplifying:
d + n = 15 .
Multiply 5 on both sides,
5d + 5n = 75 ....(iv)
Subtract (iii) from (iv):
5d = 65
d = 13
So, there are 13 dimes.
Now substitute this value of d into (iv),
n = 2
So, there are 2 nickels.
Hence.
We find that the boy can have 5 pennies, 13 dimes, and 2 nickles.
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The complete question is attached below:
A boy finds $1.05 in dimes, nickels, and pennies.
Dimes are 10 cents coins, Nickle is 5 cents coins and pennies are 1 cent coins. If there are 17 coins and the number of pennies is 5 in all.
How many coins of each type can he have?
(e) find an expression that gives, as a function of time t, the rate at which thermal energy is produced in the resistor. (use the following as necessary: t. do not include units in your answer.)
The expression for the rate of thermal energy produced in the resistor as a function of time t is P(t) = V(t)²/R.
The thermal energy that is produced in a resistor can be determined by P = I²R, where P is the power, I is the current, and R is the resistance. The current is given by I = V/R where V is the voltage. Therefore, P = V²/R.
Using the Ohm's law, the voltage is V = IR, so P = I²R = (V/R)²R = V²/R.
Thus, the rate at which thermal energy is produced in the resistor as a function of time t can be expressed as: P(t) = V(t)²/R where P(t) represents the power or rate at which thermal energy is produced in the resistor, V(t) represents the voltage as a function of time t, and R represents the resistance of the resistor.
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5. Twenty students in Mr. Martin's class each took a survey about the number of minutes they played outside. The box
plots represent the amount of time the students spent outside playing in the summer and in the winter. Which statement is
best supported by the data?
SUMMER WINTER
30
45
60
NUMBER OF MINUTES
75
90
A. The range of number of minutes outside is the same in the
summer and in the winter.
B. The median number of minutes outside in the summer is
equal to the maximum number of minutes outside in
the winter.
C. The interquartile range for the number of minutes outside is
the same in the summer and in the winter.
D. The minimum number of minutes outside in the summer is
the same as the first quartile in the winter.
The statement "The median number of minutes outside in the summer is equal to the maximum number of minutes outside in the winter" is best supported by the data (option B).
How to find the maximum number of minutes outside?Looking at the plot;
Winter: Minimum= 0 Maximum= 60 Median= 30
Range = 60 - 0 = 60
Summer: Minimum= 20 Maximum= 90 Median= 60
Range = 90 - 20 = 70
So the median number of minutes outside in the summer is
equal to the maximum number of minutes outside in the winter.
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Missing information:
The question is incomplete and the complete question is shown in the attached image.
Two fishermen, Ashraf and Khalid, went fishing. Ashraf caught x fish, Khalid caught y fish and in total they cau 69 fish. (a) Write down an equation in x and y. Ashraf caught 30% more fish than Khalid. (b)Write down another equation in x and y. (c)Solve your equations to find the number of fish caught by Ashraf and the number of fish caught h Khalid
The number of fish caught by Ashraf and Khalid by solving the equation formed is 39 and 30 respectively.
What is the Substitution method for solving equations?
In a system of linear equations to solve, we have N variables and N equations between them to solve. In substitution, we represent one variable in terms of another and replace it in the equation to convert it to a 1-variable equation and solve it.
a) Given, the number of fishes caught by Ashraf is "x" and by Khalid is "y".
As the total number of fish caught is 69, the equation is :
[tex]x + y = 69[/tex]
b) It is stated in the question that the number of fish caught by Ashraf i.e. x is 30% more than that caught by Khalid i.e. y.
The equation formed is :
x = 30% greater than y
[tex]= y + 30y/100[/tex]
[tex]= (100+30)y/100[/tex]
[tex]= 13y/10[/tex]
Hence, the equation is : [tex]10x = 13y[/tex]
c) Here, we have 2 equations and 2 variables. We use the substitution method to find the values of the variables :
[tex]y + 13y/10 = 69[/tex]
[tex](10+13)y/10 = 69[/tex]
[tex]23y/10 = 69[/tex]
[tex]y = 69 * 10 /23[/tex]
[tex]y = 30[/tex]
Putting the value of y in the first equation :
[tex]x + 30 = 69[/tex]
[tex]x = 39[/tex]
Hence, the number of fish caught by Ashraf is 39, and by Khalid is 30.
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rahquez and trinidad both leave the park at the same time, but in opposite directions. if trinidad travels 6 mph faster than rahquez and after 8 hours they are 288 miles apart, how fast is each traveling?
The propensity scoring method is a statistical technique used to adjust for differences in the characteristics of groups being compared in a study. In this case, we want to adjust for the fact that respondents aged 70 or older are underrepresented in an internet sample.
To do this, we can assign a propensity score to each individual in the sample based on their likelihood of being in the sample, given their age. We can then use this score to weight their responses to account for the underrepresentation of older individuals.
In this case, we know that respondents aged 70 or older are only one-third as likely to be in an internet sample as their actual incidence in the population. This means that we can assign a propensity score of 3 to each individual aged 70 or older in the sample, and a propensity score of 1 to everyone else.
Using these propensity scores, we can weight the responses of each individual in the sample. Responses from individuals with a propensity score of 3 would be weighted by a factor of 3, while responses from individuals with a propensity score of 1 would be weighted by a factor of 1.
By adjusting for the underrepresentation of older individuals in this way, we can obtain more accurate estimates of the characteristics of the population being studied, and reduce the potential for bias in our analysis.
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Pls just say a b c or d
i hate math fr but pls help asap
Answer:
The formula for the area of a circle is A = πr^2, where r is the radius of the circle and π (pi) is a mathematical constant approximately equal to 3.14159.
If the radius of the circle is 11 inches, then we can substitute this value into the formula:
A = πr^2
A = π(11)^2
A = π(121)
So the area of the circle is 121π square inches, which is approximately 380.1327 square inches when rounded to four decimal places.
On a certain hot summers day, 402 people used the public swimming pool. The daily prices are 1. 50$ for children and 2. 00$ for adults. The receipts for admission totaled 648. 50$. How many children and how many adults swam at the public pool that day?
From the given information provided, there were 311 children who swam at the pool that day.
Let's use C to represent the number of children who swam at the pool and A to represent the number of adults who swam at the pool.
From the problem, we know that:
C + A = 402 (Equation 1) (The total number of people who used the pool was 402)
1.50C + 2.00A = 648.50 (Equation 2) (The total receipts from admission were $648.50)
To solve for C and A, we need to eliminate one of the variables. We can do this by multiplying Equation 1 by 1.50, which will give us:
1.50C + 1.50A = 603 (Equation 3)
Now we can subtract Equation 3 from Equation 2 to eliminate C:
2.00A - 1.50A = 648.50 - 603
0.50A = 45.50
A = 91
So there were 91 adults who swam at the pool that day. To find the number of children, we can substitute A = 91 into Equation 1:
C + 91 = 402
C = 311
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the volume of a cube decreases at a rate of 6 m 3 / s . find the rate at which the side of the cube changes when the side of the cube is 4 m . answer exactly or round to 2 decimal places.
The rate at which the side of the cube changes when the side of the cube is 4 m is -1/8 m/s (or approximately -0.125 m/s).
Let's use the formula for the volume of a cube:
V = s³
where V is the volume and s is the length of one side of the cube. To find the rate of change of the side length, we need to differentiate this formula with respect to time t:
dV/dt = d/dt (s³) = 3s² ds/dt
We know that dV/dt = -6 m³/s (the negative sign indicates that the volume is decreasing), and when s = 4 m, we have:
-6 = 3(4²) ds/dt
Simplifying this equation gives us:
ds/dt = -6 / (3*4²) = -1/8 m/s
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