the lifetime of lightbulbs that are advertised to last for 4100 hours are normally distributed with a mean of 4400 hours and a standard deviation of 300 hours. what is the probability that a bulb lasts longer than the advertised figure?

Answer: We know that the formula for the circumference of a circle is:

Circumference = 2πr

where r is the radius of the circle.

In this problem, we are given the circumference, which is 5π ft, so we can set up an equation:

5π = 2πr

Dividing both sides by 2π, we get:

r = 5/2 feet

Now that we know the radius, we can use the formula for the area of a circle:

Area = πr^2

Substituting in the value of r that we found, we get:

Area = π(5/2)^2

Area = π(25/4)

Simplifying, we get:

Area = 25π/4

Therefore, the area of the circle is 25π/4 square feet.

Step-by-step explanation:

Therefore , the correct option is A Dimension of exisiting patio is 6feet by 8feet.

Ms. Khan wants to add x feet onto each side of an existing  patio, then the area of the existing patio is (x-2)² square feet.

Define square feet?

In the United States, Canada, China, and the United Kingdom, the square foot  is a commonly used imperial measure of area. Its emblem is a straightforward square with a vertical line cutting it in half .

The Imperial system uses a combination of feet, inches, miles, and gallons.

So,

we can write (x-2)² = x²+14x+48.

Expanding the left side gives us x²-4x+4 = x²+14x+48.

Simplifying gives us 18x = 44.

Therefore, x = 11/4.

The dimensions of the square patio are (11/4 - 2)×2 feet by (11/4 - 2)×2 feet which is equal to( 3/4)×2 feet by 6/8

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Answer:

The shape in the image is a trapezoid. It is a quadrilateral with one pair of parallel sides.

Step-by-step explanation:

Answer: Noemi strings together 6 green beads at $0.75 each to make the bracelet.

Step-by-step explanation:Let's start by using algebra to solve the problem. We can begin by letting x be the number of green beads that Noemi strings together. Then, the cost of the green beads will be 0.75x, and the cost of the blue beads will be 3 × 0.30 = 0.90.

The total cost of the bracelet will be the sum of the cost of the green and blue beads, which is 0.75x + 0.90. The total number of beads on the bracelet will be x + 3.

We know that the average cost per bead is $0.60. We can write this as:

(0.75x + 0.90)/(x + 3) = 0.60

Now we can solve for x:

0.75x + 0.90 = 0.60(x + 3)

0.75x + 0.90 = 0.60x + 1.80

0.15x = 0.90

x = 6

Therefore, Noemi strings together 6 green beads at $0.75 each to make the bracelet.

Answer:

Step-by-step explanation:

by identity       a²-b² =(a-b)(a+b)

9x² = (3x)²

4(y+2x)² = 2²(y+2x)² = (2(y+2x))²=(2y+4x)²

so : a = 3x   and b = 2y+4x

put a and b in this identity     a²-b² =(a-b)(a+b) ....continu

The equation of the circle is represented by [tex]x^{2} + (y-3)^{2} = 16[/tex] with radius of the circle as r = 4.

How to find the equation of the circle?

To find the equation of the circle is

[tex](x-h)^{2} + (y-k)^{2} = r^{2}[/tex]

here h is the x- coordinate of the center of the circle

        k is the y- coordinate of the center of the circle

        r is the radius of the circle

From the given figure,

h = 0

k = 3

r = 4

putting all the values of the above equation

[tex](x-0)^{2} + (y - 3)^{2} = 4^{2}[/tex]

[tex]x^{2} + (y-3)^{2} = 16[/tex]

Therefore the equation of the circle is

[tex]x^{2} + (y-3)^{2} = 16[/tex]

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that means that the slope for all three points is the same, since all are collinear, hmmm what's the slope of (1 , 2) and (7 , -1)?

[tex](\stackrel{x_1}{1}~,~\stackrel{y_1}{2})\qquad (\stackrel{x_2}{7}~,~\stackrel{y_2}{-1}) ~\hfill \stackrel{slope}{m}\implies \cfrac{\stackrel{\textit{\large rise}} {\stackrel{y_2}{-1}-\stackrel{y1}{2}}}{\underset{\textit{\large run}} {\underset{x_2}{7}-\underset{x_1}{1}}} \implies \cfrac{ -3 }{ 6 } \implies - \cfrac{1 }{ 2 }[/tex]

ahaaa!, that means from from (-2 , y) and either of those points is the same slope of -1/2, so

[tex](\stackrel{x_1}{-2}~,~\stackrel{y_1}{y})\qquad (\stackrel{x_2}{7}~,~\stackrel{y_2}{-1})[/tex]

[tex]\stackrel{slope}{m}\implies \cfrac{\stackrel{\textit{\large rise}} {\stackrel{y_2}{-1}-\stackrel{y1}{y}}}{\underset{\textit{\large run}} {\underset{x_2}{7}-\underset{x_1}{(-2)}}} ~~ = ~~\stackrel{\stackrel{\textit{\small slope}}{\downarrow }}{ \cfrac{ -1 }{ 2 }}\implies \cfrac{-1-y}{7+2}=\cfrac{-1}{2}\implies \cfrac{-1-y}{9}=\cfrac{-1}{2} \\\\\\ -2-2y=-9\implies -2y=-7\implies y=\cfrac{-7}{-2}\implies y=\cfrac{7}{2}[/tex]

Answer:

Step-by-step explanation: (-2, y) (1, 2) and (7, -1) wat is the value of y

Answer:

You may see many real-life examples of collinearity such as a group of students standing in a straight line, a bunch of apples kept in a row, next to each other, etc. In geometry, two or more points are said to be collinear, if they lie on the same line.

Step-by-step explanation:

Hope this helps!=D

Ll término general de la sucesión 4, 9, 14, 19, 24 es an = 5n - 1.

La sucesión 4, 9, 14, 19, 24 es una progresión progresión aritméticacon una diferencia común de 5.

El término general de una progresión aritmética se puede encontrar utilizando la fórmula:

an = a1 + (n - 1)d

donde:

an = el término general que se desea encontrar

a1 = el primer término de la progresión

n = la posición del término que se desea encontrar

d = la diferencia común de la progresión

En este caso, a1 = 4 y d = 5. Para encontrar el término general para cualquier posición n, podemos sustituir estos valores en la fórmula y simplificar:

Por lo tanto, el término general de la sucesión 4, 9, 14, 19, 24 es an = 5n - 1.

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Step-by-step explanation:

The green triangle :

The angle x is 65°

this is because both the sides are equal so when the other angle is 65° angle x is also 65°

The blue triangle :

The angle x is 25°

this is because both the sides are equal so when the other angle is 25° angle x is also 25°

The red triangle :

The angle x is 45°

this is because both the sides are equal so when the other angle is 45° angle x is also 45°

The missing values of the proportion are;

a. 18

b. 19.5

c. 45%

d. 180

The percentage of a number can be defined as the fraction of a number and hundred.

It is represented with the symbol, %.

From the information given, we have that'

1. 6% of 30

This is represented as;

60 /100 × 30

Multiply the values

18

2. 65% of 30

This is represented as

65/100 × 30

Multiply the values

1950/100

19.5

3. 18/40 × 100

Multiply the values

1800/40

45%

4. 81 = 45/100x

cross multiply the values

x = 180

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Vanessa would need to drink about ten cups of liquid to replace the weight she lost while running.

The amount of water needed to be drank is approximately 2 cups of water are required for every pound of body weight reduced.

Vanessa would need to drink about ten cups of liquid to replace the weight she lost while running.

Refilling fluid: To add fluid to something that has been drained, in particular: to replace any fluids the body has lost from dehydration. assist a patient in hydrating.

Oral rehydration solutions (ORSs), which include Pedialyte, are used to treat dehydration. ORSs, which help replace lost fluids, include the correct ratio of salt, sugar, potassium, and other minerals.

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Complete question - A general rehydration recommendation after exercise is 2.5 cups of fluid for every 1 pound of body weight lost. Using this guideline, how much fluid would Vanessa need to consume to make up for the weight that was lost during her run?

Calculation: 2 cups x lbs of body weight lost = cups of water needed

A. Approximately 4 cups of fluid

B. Approximately 8 cups of fluid

C. Approximately 6 cups of fluid

D. Approximately 10 cups of fluid

7. Vanessa asks if she should start using sports drinks. Which of the following would best answer Vanessa's question?

A. A sports drink is not beneficial for you at this time and may provide unnecessary calories.

B. A sports drink would be beneficial to replace fluid and electrolytes when exercising for less than 30 minutes.

C. A sports drink would be beneficial on days when you are exercising for over an hour at a higher intensity.

8. If Vanessa uses a sports drink in the future, how much glucose, sodium and potassium should be provided per 24 fluid ounces of sports drink?

A. No more than 30 g of glucose, 450 g of sodium and 225 mg of potassium.

B. No more than 75 g glucose, 150 mg sodium, 175 mg potassium.

C. No more than 15 g of glucose, 500 mg sodium, 200 mg potassium.

D. No more than 45 g of glucose, 225 mg of sodium and 275 mg of potassium.

One large bucket of popcorn costs $6 and one box of candy costs $3.75.

Let's call the cost of one large bucket of popcorn as "p" and the cost of one box of candy as "c". We can set up two equations based on the information given in the problem :

Equation 1: 4p + 5c = 42.75 (first group's purchase)

Equation 2: 3p + 2c = 25.50 (second group's purchase)

We can use any method to solve these equations, such as substitution or elimination.

Let's use the elimination method by multiplying both sides of Equation 1 by 2 and both sides of Equation 2 by -5 to eliminate "c" and get an equation in terms of "p":

8p + 10c = 85.50 (multiplying Equation 1 by 2)

-15p - 10c = -127.50 (multiplying Equation 2 by -5)

Adding the two equations, we get :

-7p = -42

p = 6

Now we can substitute the value of "p" into either Equation 1 or Equation 2 to solve for "c". Let's use Equation 1:

4(6) + 5c = 42.75

24 + 5c = 42.75

5c = 18.75

c = 3.75

Therefore, one large bucket of popcorn costs $6 and one box of candy costs $3.75.

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The number of people who don't use any alternative transportation mode is 18 people.

To find the number of people who don't use any alternative transportation mode we can use the principle of inclusion and exclusion (PIE) method.

adding the number of people who use each mode:

walk = 144

bus = 102

bicycle = 105

Next, subtract the number of people who use two modes:

walk and bus = 78

walk and bicycle = 65

bus and bicycle 45

adding people who use all three modes:

all three modes of transportation = 34

Therefore, the total number of people who use at least one alternative mode of transportation is:

= 144 + 102 + 105 - 78 - 65 - 45 + 34

= 197

To find the number of people who don't use any alternative transportation. we need to subtract the number of people who use at least one alternative mode of transportation from the total number of people in the survey:

= 215 - 197

= 18

Therefore, The number of people who don't use any alternative transportation mode is 18.

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Answer:

Step-by-step explanation:

4/9

By the number of red marbles taken out, we expect that 12/27=4/9 of the marbles are red. Therefore, the probability of the next marble being red is 4/9.

Answer:

if its a circle

Volume - 7.20 cm

Surface area 18.1 cm

Step-by-step explanation:

Volume of a sphere = 4/3 πr^3

4/3 (3.14) 1.2^3

4/3 (3.14) 1.728

4/3 of 5.42592=

7.23456 or 7.20

Surface area of sphere = 4πr²

4(3.14) 1.2^2

4(3.14) 1.44

4 (4.5216) =

18.0864 or 18.1

The domain of the function is all real numbers greater than or equal to 1, or in interval notation: the correct answer is (d) x2≥7.

The domain of a function is the set of all possible values of the independent variable (usually denoted by "x") for which the function is defined. It is the set of all input values for which the function produces a valid output value.

For example, consider the function f(x) = 1/x. The domain of this function consists of all real numbers except for 0, since division by zero is undefined. Therefore, the domain of the function is:

Domain(f) = {x | x ≠ 0}.

In the given question,

The square root function is defined for non-negative values of its argument. Therefore, the expression inside the square root must be greater than or equal to zero.

x + 6 - 7 ≥ 0

Simplifying the inequality, we get:

x - 1 ≥ 0

x ≥ 1

Therefore, the domain of the function is all real numbers greater than or equal to 1, or in interval notation:

[1, ∞)

So the correct answer is (d) x2≥7.

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The probability that the mean of a sample of 45 boards will be between 94.5 inches and 95.1 inches, given that the length of timber cuts are normally distributed with a mean of 95 inches and a standard deviation of 0.52 inches, can be calculated using the Central Limit Theorem. The theorem states that the distribution of sample means will be approximately normally distributed with a mean equal to the population mean and a standard deviation equal to the population standard deviation divided by the square root of the sample size.

In this case, the population mean (μ) is 95 inches, the population standard deviation (σ) is 0.52 inches, and the sample size (n) is 45. The standard deviation of the sample mean is σ/√n = 0.52/√45 ≈ 0.0775.

To find the probability, we can use the Z-score formula:

Z = (X - μ) / (σ/√n)

For the lower limit of 94.5 inches, the Z-score is:

Z1 = (94.5 - 95) / 0.0775 ≈ -6.45

For the upper limit of 95.1 inches, the Z-score is:

Z2 = (95.1 - 95) / 0.0775 ≈ 1.29

Now, using a Z-table or calculator, find the probability for each Z-score:

P(Z1) ≈ 0 (since it is a very low Z-score)
P(Z2) ≈ 0.9015

The probability that the mean of the sample will be between 94.5 inches and 95.1 inches is the difference between these probabilities:

P(94.5 < X < 95.1) = P(Z2) - P(Z1) = 0.9015 - 0 ≈ 0.9015, or approximately 90.15%.

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The area of triangle XYZ when using YZ as the base, can be found to be 24 square units.

To find the area of triangle XYZ, we can use the Shoelace Theorem (also known as the Surveyor's Formula). Given the coordinates of the vertices, the area of the triangle is:

Area = (1/2) x |(x1(y2 - y3) + x2(y3 - y1) + x3(y1 - y2))|

Plugging in the coordinates:

Area = (1/2) x |(2(9 - 1) + 10(1 - 5) + 6(5 - 9))|

Area = (1/2) x |(2(8) - 10(4) + 6(-4))|

Area = (1/2) x |(16 - 40 - 24)|

Area = (1/2) x |-48|

Area = 24 square units

The area of triangle XYZ is 24 square units.

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The probability of tossing heads and then tails, given that the coin already shows heads in the first toss, is 1/2.

Let's first find the sample space of this experiment, which is {HH, HT, TH, TT}. We know that the coin has already shown heads in the first toss, so we can eliminate TT from the sample space. Therefore, the new sample space becomes {HH, HT, TH}.

Out of these three possible outcomes, only one satisfies the given condition of tossing heads and then tails, which is HT. Therefore, the probability of tossing heads and then tails, given that the coin already shows heads in the first toss, is 1/2 (i.e., one favorable outcome out of two possible outcomes).

Therefore, the probability of tossing heads and then tails, given that the coin already shows heads in the first toss, is 1/2, as there is only one favorable outcome out of the two possible outcomes in the new sample space after eliminating TT.

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Answer:

2x

Step-by-step explanation:

(12x^2-10x)/6x-5

The given statement that 'the one-sample z-test is used when the population standard deviation is unknown.' is true.

Z-test is used to test hypotheses about the population means when we don't have any information about the population standard deviation and the sample size is huge. According to the given statement, the standard error of the mean can be estimated with the help of sample standard deviation, and the test statistic can be approximated by a standard normal distribution.

In another case where the sample size is too small, T-test should be used instead of Z-test. This is encouraged because of increased efficiency.

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The ladder reaches the wall at a height of 8.66 from the ground. We solve this problem with an understanding of trigonometry.

From the given situation, we can construct a right-angled triangle where the base is the distance between the ladder and the wall, the hypotenuse is the length of the ladder i.e. 10 feet and the height up to which it reaches is perpendicular (let's assume that to be x).

We can use trigonometry's sine relation to solve this problem, according to which,

sine(60°)=perpendicular/hypotenuse

sin(60°)=x/10

0.866=x/10

so,

x=10×0.866

x=8.66

Hence, we find that The ladder reaches the wall at a height of 8.66 from the ground.

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Answer:

1/10 of the circle (36° central angle).

Step-by-step explanation:

2/20 = 1/10

A circle has 360 degrees, so the central angle will be 1/10 × 360° = 36°.

The for the given volume of 12,500 cubic inches for rectangular prism, the base area will be estimated by equation: A. 12500=50B.

A rectangular prism is one of the more typical shapes for prisms. One definition of a rectangular prism is a prism with rectangle-shaped bases. The other surfaces are also rectangles because the bases are rectangles. These are a rectangular prism's characteristics:

Given:

volume of rectangular prism = 12,500 cubic inches

Height h = 50 inches.

Let the base area be B.

Then,

volume of rectangular prism = B*h

12500 = B*50

12500 = 50B  (required equation)

B = 12500/50

B = 250 unit sq.

Thus, the for the given volume of 12,500 cubic inches for rectangular prism, the base area will be estimated by equation: A. 12500=50B.

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QS is the diameter of circle

A circle is a two-dimensional geometric shape consisting of all points in a plane that are a given distance from a fixed point called the center. It is a closed shape, meaning it has no beginning or end, and every point on its perimeter is equidistant from the center. The distance from the center to any point on the circle is called the radius, and the distance across the circle through the center is called the diameter

In the given circle QS bisects perpendicularly the chord PR in two equal part. so, it must pass through center of circle.

QS is passing through center.

The chord passing through center is called as diameter of circle.

Hence, QS is the diameter of circle.

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The expression for the given statement can be written as (25 + h) / f³.

A sum is the result of adding two or more numbers together. For example, the sum of 2 and 3 is 5, which is obtained by adding 2 and 3. In mathematical notation, we can represent this as:

2 + 3 = 5

The expression for the given statement can be written as:

(25 + h) / f³

where h and f are variables.

If you have specific values for h and f, you can substitute them into the expression and evaluate it. Otherwise, you can leave the expression as it is.

The expression "(25 + h) / f³" represents the result of adding 25 to the value of h, and then dividing the sum by the cube of the value of f.

In general, if you have specific values for h and f, you can substitute them into the expression and evaluate it. If you don't have specific values for h and f, you can leave the expression as it is. This expression is an algebraic expression, which means it contains variables (h and f) and mathematical operations (+, /, and ³).

Note that division is performed before addition, so the sum of 25 and h is first calculated, and then the result is divided by f³.

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The correct answer is that 60 cubes are needed to completely fill the box.

What are the cubes?

We can find the number of cubes needed to fill the box by dividing the volume of the box by the volume of one cube. Since the cubes are 1/2 inch on each side, their volume is (1/2)³ = 1/8 in³

To find the volume of the box, we need to multiply its length, width, and height:

Volume of box = 5 × 4 × 3 = 60 in³

Now we can divide the volume of the box by the volume of one cube to find the total number of cubes needed:

Total cubes = Volume of box / Volume of one cube

Total cubes = 60 / (1/8)

Total cubes = 480

Therefore, the correct answer is not one of the given options. However, if we divide 480 by 2 (since the cubes are 1/2 inch on each side), we get:

Total cubes = 480 / 2 = 240

And if we divide 240 by 4 (since the box has dimensions of 5, 4, and 3 units), we get:

Total cubes = 240 / 4 = 60

Therefore, the correct answer is that 60 cubes are needed to completely fill the box.

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Solve and get |3x - 0.5| > 1.5: x < -0.333 or x > 1, The solution to |3x - 0.5| = 1.5 is: x = 0 or x = 1, The solution to |3x - 0.5| < 1.5 is: -0.333 < x < 0.833

Depending on whether the expression contained in the absolute value is positive, negative, or zero, there are three scenarios that need to be taken into account in order to system of equations the absolute value inequalities involving |3x - 0.5|.

Example 1: (3x - 0.5) > 0

The absolute value expression in this situation is reduced to 3x - 0.5. We thus have:

3x - 0.5 > 1.5

When we solve for x, we get x > 1.

Example 2: (3x - 0.5) < 0

The absolute value expression in this situation is -(3x - 0.5), which is equivalent to -3x + 0.5. We thus have:

-3x + 0.5 > 1.5

The result of solving for x is: x -0.333

Example 3: (3x - 0.5) = 0

The equation for the absolute value in this situation is |0|, which equals 0. The result is either 3x - 0.5 = 1.5 or 3x - 0.5 = -1.5.

The results of each equation's x term are: x = 1 or x = 0.

As a result, the answer to |3x - 0.5| > 1.5 is either x -0.333 or x > 1.

x = 0 or x = 1 is the answer to the equation |3x - 0.5| = 1.5.

The answer to the equation |3x - 0.5| 1.5 is: -0.333 x 0.833

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Answer:

To find the point of intersection between the two lines represented by the equations:

y = 2x + 35

y = 9x

We can set the two equations equal to each other and solve for x:

2x + 35 = 9x

Subtracting 2x from both sides:

35 = 7x

Dividing both sides by 7:

x = 5

Now that we have found the value of x, we can substitute it back into either of the original equations to find the value of y. Using the second equation:

y = 9x = 9(5) = 45

Therefore, the point of intersection between the two lines is (5, 45).

Step-by-step explanation:

Answer:

x=5 and y=45; (5,45)

Step-by-step explanation:

Step One→ Solve one equation for either x or y.

Step Two→ Substitute the expression from step one into the 2nd equation.

Step Three→ Solve the second equation for the given variable.

Step Four→ Plug your solution back into the first equation.

Step Five→ Write your solution as a point.