Identifying a Valid Sample Natasha wants to find out if the neighborhood supports lowering the speed limit on the street in front of her school. Which is a valid sample for the survey? students in Natasha’s social studies class parents who live in a town 15 miles away from Natasha’s school the first 5 drivers who drive past Natasha’s school one morning thirty residentsIdentifying a Valid Sample Natasha wants to find out if the neighborhood supports lowering the speed limit on the street in front of her school. Which is a valid sample for the survey?
A. students in Natasha’s social studies class parents who live in a town 15 miles
B.away from Natasha’s school the first 5 drivers who drive past Natasha’s C.school one morning thirty residents who live within a 2-miles radius of D.Natasha’s school who live within a 2-miles radius of Natasha’s school

The solutions are - 0.8 and 1

Step-by-step explanation:

In the quadratic equation ax² + bx + c = 0

Assume that the solutions of the equations are m and n

∵ 5x² - x - k = 0

- By comparing it by the form above

∴ a = 5, b = -1 , c = -k

- Use the rule of the sum of the two solutions above

∵ The sum of the two solutions = [tex]\frac{-b}{a}[/tex]

∴ The sum of the two solutions = [tex]\frac{-(-1)}{5}=0.2[/tex]

∵ The two solutions are m and n

∴ m + n = 0.2 ⇒ (1)

∵ The difference of the two solutions is 1.8

∴ m - n = 1.8 ⇒ (2)

Now we have a system of equations to solve

Add Equations (1) and (2) to eliminate n

∴ 2m = 2

- Divide both sides by 2

∴ m = 1

- Substitute the value of m in equation (1) to find n

∴ 1 + n = 0.2

- Subtract 1 from both sides

∴ n = -0.8

The solutions are - 0.8 and 1

If you want to find the value of k

∵ The product of the solutions is [tex]\frac{c}{a}[/tex]

∴ The product of the solutions = [tex]\frac{-k}{5}[/tex]

∵ m × n = 1 × (-0.8) = - 0.8

- Equate  [tex]\frac{-k}{5}[/tex]  by - 0.8

∴ [tex]\frac{-k}{5}=-0.8[/tex]

- Multiply both sides by -5

∴ k = 4

∴ The equation is 5x² - x - 4 = 0

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Answer:

x = 1; x = -0.8

Step-by-step explanation:

Here is a simpler approach if needed for future students:

5x^2-x-k = 0,

System of Equations: x1 - x2 = 1.8 & x1 + x2 = 1/5 = 0.2 (if x1 and x2 are roots)

Now let's add the two:

x1 - x2 = 1.8

+ x1 + x2 = 0.2

----------------------

2x1 = 2,

x1 = 2/2 = 1

- x2 = 1.8 - 1 = 0.8 => x2 = -0.8

Answer:

24 degrees

Step-by-step explanation:

The distance from 15 degrees to 0 degrees is 15, and the distance from 0 degrees to -9 degrees is 9, so then the total distance from 15 degrees to -9 degrees is (15+9 degrees) which adds up to be 24 degrees

Answer:

The total weight of the water in a full tank, to the nearest pound is 3527 pounds per cubic foot

Step-by-step explanation:

Given:

Diameter  of the hemispherical tank = 6 feet

Weight of water per cubic foot =  62. 4 pounds

To Find:

The total weight of the water in a full tank, to the nearest pound?

Solution:

We know that the volume of a sphere is:

[tex]V =\frac{4}{3}\pi r^3[/tex]

where  

r = is the radius

In the question we are given with diameter,

So

[tex]radius = \frac{diameter}{2}[/tex]

radius = [tex]\frac{6}{2}[/tex]

Radius = 3

We need the volume of the hemisphere

So the volume of the hemisphere will be half of the volume of teh sphere

[tex]\frac{V}{2} = \frac{2}{3}\pi r^3[/tex]

Thus the volume of the hemisphere is

[tex]V =\frac{2}{3} \pi r^3[/tex]

Now substituting the values

[tex]V = \frac{2}{3} \pi(3)^3[/tex]

[tex]V = \frac{2}{3}\pi(27)[/tex]

[tex]V = \frac{54 \pi}{3}[/tex]

[tex]V = \frac{169.56}{2}[/tex]

V=  56.52 cubic foot

Now, the total weight of water of:

W =  56.52 x 62.4

W= 3526.848 pounds per cubic foot

To the nearest pounds

W= 3527 pounds per cubic foot

Answer:

3529

Step-by-step explanation:

If you are here from delta math this is the Answer

Answer:

1.536

Step-by-step explanation:

Answer:

No, (4•6)^3 is not  equivalent to 4•6^3

Step-by-step explanation:

(4•6)^3

4•6^3

Let's solve each one at a time, starting with (4•6)^3

(4•6)^3

Multiply inside the parenthesis first

24^3

Multiply 24 by itself 3 times (Exponents)

24 * 24 * 24

13,824

Now let's solve  4•6^3

4•6^3

Exponents come before multiplication in the order of operations, so multiply 6 by itself 3 times.

4 * (6x6x6)

4 * 216

864

Now we can compare the solutions

13,824 > 864

No, 13,824 is not equivalent to 864.

Hope this helps :)

Answer: 72 ft

Step-by-step explanation:

We can solve this problem using geometry, if we draw two righ triangles (figure attached):

-One formed by you, assuming you are 6 ft tall, and the ground

-The other formed by the height  of the cliff, the bottom of the cliff and the ground.

Both triangles are congruent, having the mirror as a common vertex, hence we can use the following relation to find :

[tex]\frac{6 ft}{y}=\frac{5 ft}{60 ft}[/tex]

Isolating :

[tex]y=\frac{(60 ft)(6 ft)}{5 ft}=72 ft[/tex] This is the height of the cliff

The calculated height of the cliff is 72 feet.

To determine the height of the cliff, we use a mirror and the property of the reflection of light. Here are the steps to solve the problem:

height of cliff / 60 feet = 6 feet / 5 feet.

    5. Solve for the height of the cliff:

height of cliff = (6 feet / 5 feet) * 60 feet = 72 feet.

Thus, the height of the cliff is 72 feet.

The height of a randomly chosen basketball player is a continuous random variable since height is measured and can take on an infinite range of values.

The random variable described, the height of a randomly chosen basketball player, is a continuous random variable. This is because height can take an infinite number of possible values within a range and is measured rather than counted. Unlike discrete random variables, which have countable values such as the number of heads in a coin toss, continuous random variables like height are measured and can include values such as 6'1" or 6'1.5". The values are on a continuous scale, and therefore the probability distribution of a continuous random variable is concerned with the probability of the variable falling within a certain range, rather than taking specific countable values.

Answer:

see the explanation

Step-by-step explanation:

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form [tex]k=\frac{y}{x}[/tex] or [tex]y=kx[/tex]

In a proportional relationship the constant of proportionality k is equal to the slope m of the line and the line passes through the origin

Let

x ----> the time in seconds

y ---> the distance in meters

In this problem we have a proportional relationship between the variables x and y

Find the constant of proportionality k

[tex]k=\frac{y}{x}[/tex]

For x=2, y=25 ---> [tex]k=\frac{25}{2}=12.5[/tex]

For x=4, y=50 ---> [tex]k=\frac{50}{4}=12.5[/tex]

For x=6, y=75 ---> [tex]k=\frac{75}{6}=12.5[/tex]

For x=8, y=100 ---> [tex]k=\frac{100}{8}=12.5[/tex]

so

The value of k is [tex]12.5\ \frac{m}{sec}[/tex]

In this problem the value of k or slope represent the speed of the train

The linear equation is equal to

[tex]y=12.5x[/tex]

or

[tex]Distance=12.5Time[/tex]

Answer:

C. The men simply keep chasing Nicki, and their motivations are not

revealed

Answer:A $35 decrease followed by a $25 increase is less than the original.

A 50% decrease then 33.333% increase is the same.

A 30% increase then 15% decrease is more.

A 50% decrease then 100% increase is the same.

A 70% increase then 50%decrease is less.

Step-by-step explanation:

Answer:

270

Step-by-step explanation:

y < –12

Solution:

Step 1: Given inequality is y + 15 < 3.

To find the solution to the inequality.

Step 2: Subtract –15 on both sides to equal the expression.

⇒ y + 15 –15 < 3 –15

Step 2: Using addition identity property, any number adding with zero gives the number itself.

⇒ y + 0 < –12

⇒ y < –12

Hence the solution to the inequality is y < –12.

Answer:

Step-by-step explanation:

It’s b

The system of equation is:

x + y = 20

x - y = 4

She has 12 dimes and 8 nickels

Step-by-step explanation:

The given is:

We need to write a system of equations that represents the problem and how

many of each coin she has

Assume that she has now x dimes and y nickels

∵ She has x dimes and y nickels

∵ She has a total of 20 coins

- Add x and y, then equate the sum by 20

∴ x + y = 20 ⇒ (1)

∵ One dime = 10 cents

∵ One nickels = 5 cents

- Multiply x by 10 and y by 5 to find how many cents she has now

∵ She has now (10x + 5y) cents

∵ The dimes were nickels and the nickels were dimes

- Multiply x by 5 and y by 10 to find how many cents she has

   after the change

∴ She had after the change (5x + 10y) cents

∵ The value after the change is less than the value now by

   20 cents

- Subtract (5x + 10y) from (10x + 5y) and equate the difference

   by 20

∴ (10x + 5y) - (5x + 10y) = 20

- Add the like terms in the left hand side

∴ (10x - 5x) + (5y - 10y) = 20

∴ 5x - 5y = 20

- Divide both sides by 5

∴ x - y = 4 ⇒ (2)

The system of equation is:

x + y = 20

x - y = 4

Now we have a system of equations to solve it

Add equations (1) and (2) to eliminate y

∴ 2x = 24

- Divide both sides by 2

∴ x = 12

- Substitute the value of x in equation (1) to find y

∵ 12 + y = 20

- Subtract 12 from both sides

∴ y = 8

She has 12 dimes and 8 nickels

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The store initially bought 82 half gallons of milk.

To solve the problem, we need to find out how many half gallons of milk the store initially bought. We can set up an equation to represent the situation where the cost of milk is subtracted from the sales to find the profit.

Let's assume the store bought x half gallons of milk. Then, the cost of the x half gallons is x multiplied by $2.70:

Cost = 2.70x dollars

The store ruined 12 half gallons, so they can only sell x - 12 half gallons. The revenue from selling each half gallon is $4.02, so the total revenue from selling x - 12 half gallons is:

Revenue = 4.02(x - 12) dollars

We are told the store made a profit of $60, so the revenue minus the cost equals the profit:

4.02(x - 12) - 2.70x = 60

Now we solve for x:

4.02x - 48.24 - 2.70x = 60

1.32x - 48.24 = 60

1.32x = 108.24

x = 82 half gallons

Therefore, the store initially bought 82 half gallons of milk.

Answer:

just use mathpapa it's a game changer itll change your life

The depth of sun after 5 minutes is 809.82 feet

Solution:

A submarine dives at an angle of 13 degrees to the surface of the water

The submarine travels at a speed of 720 feet per minute

The figure is attached below

ACB is a right angled triangle

AB is the distance between surafce of water and submarine

BC is the depth of submarine

Let "x" be the depth of sun after 5 minutes

Therefore, distance between submarine and surface of water is:

[tex]AB = 720 \frac{feet}{minute} \times 5 \text{minute} = 3600 feet[/tex]

Submarine dives at an angle of 13 degrees to the surface of the water

Therefore, angle A = 13 degrees

Now we have to find BC

By definition of sine,

[tex]sin \theta = \frac{opposite}{hypotenuse}[/tex]

Here, opposite = BC = x

hypotenuse = AB = 3600 feet

Thus, we get,

[tex]sin \theta = \frac{BC}{AB}\\\\sin \theta = \frac{x}{3600}\\\\sin 13 = \frac{x}{3600}\\\\0.2249 = \frac{x}{3600}\\\\x = 3600 \times 0.2249\\\\x = 809.82[/tex]

Thus the depth of sun after 5 minutes is 809.82 feet

Through algebra, we found that Xavier's current age is 61, which makes Yolanda 65. Subtracting the 40 years of marriage from their current ages, we determined that Yolanda was 25 years old when they got married.

The question given by the student is a problem that can be solved with simple algebra. To find out how old Yolanda was when they married, we first need to establish the current ages of Xavier and Yolanda based on the information given.

Let's denote Xavier's current age as x years. Consequently, Yolanda's current age will be x + 4 years (since she is 4 years older than Xavier). According to the problem, the sum of their ages now is 126 years. We can set up the following equation based on this information:

x + (x + 4) = 126

By solving the equation:

Combine like terms: 2x + 4 = 126

Subtract 4 from both sides: 2x = 122

Divide both sides by 2: x = 61

This means that Xavier is now 61 years old, and Yolanda is x + 4, which is 65 years old. Since they have been married for 40 years, we subtract 40 from their current ages to get their ages at the time they got married. So, Yolanda was 25 years old when she got married.

Answer:

Slope is 1/4     y-intercept is 0

Step-by-step explanation:

I uploaded the graph below

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Answer: 2

Step-by-step explanation:    Edge 2023

Final answer:

To find the average number from a list of numbers, add up all the numbers and then divide the sum by the total number of numbers.

Explanation:

The question asks for the average number from a given list of numbers. To find the average, you add up all the numbers in the list and then divide the sum by the total number of numbers in the list.

In this case, the average of the numbers 1, 0, 1, 5, 6, 3, and 4 can be found by adding those numbers together (1 + 0 + 1 + 5 + 6 + 3 + 4) and then dividing the sum by 7 (the total number of numbers in the list). So, the average is 4.

Answer:

At the donut shop, Karley and 24 of her co-workers have split the tip jar. There is $42.48 in the tip jar. How much money does each worker get from the jar?

Answer:

It is important to use mixed numbers in real life, because it can help you find the measurements for when you are buying ingredients or baking something.

Hope this helps ;)

Step-by-step explanation:

Answer:

Step-by-step explanation:

The given equations are x = 4 - 2y.......(1) and 3x - 2y = 4......(2).

Putting the value of the first equation in the second, we get

3x - 2y = 4

or, 3(4 - 2y) - 2y = 4

or, 12 - 6y - 2y = 4

or, 8y = 8

or, y = 1.

Putting the value of y in the first equation, we get x = 4 - 2 = 2.

Answer:

The answer is [tex]x=2[/tex] and [tex]y=1.[/tex]

Step-by-step explanation:

Given:

X=4-2y

3x-2y=4

Now, to solve it by substitution.

[tex]x=4-2y[/tex]  .....(1)

[tex]3x-2y=4[/tex]  ......(2)

Now, solving the equation (2) by substitution:

[tex]3x-2y=4[/tex]

Substituting the value of [tex]x[/tex] from equation (1):

[tex]3(4-2y)-2y=4[/tex]

[tex]12-6y-2y=4[/tex]

[tex]12-8y=4[/tex]

Subtracting both sides by 12 we get:

[tex]-8y=-8[/tex]

Dividing both sides by -8 we get:

[tex]y=1.[/tex]

Now, substituting the value of [tex]y[/tex] in equation (1):

[tex]x=4-2y[/tex]

[tex]x=4-2(1)[/tex]

[tex]x=4-2\times1[/tex]

[tex]x=4-2[/tex]

[tex]x=2.[/tex]

Therefore, the answer is [tex]x=2[/tex] and [tex]y=1.[/tex]

Answer:

6

Step-by-step explanation:

Given

2x - 2y ← factor out 2 from each term

= 2(x - y) ← substitute x - y = 3 into the expression

= 2(3)

= 6

An expression is a way of writing a statement with more than two variables or numbers with operations such as addition, subtraction, multiplication, and division.

x - y = 3

2x - 2y

The value of 2x - 2y is 6.

An expression is a way of writing a statement with more than two variables or numbers with operations such as addition, subtraction, multiplication, and division.

Example: 2 + 3x + 4y = 7 is an expression.

We have,

x - y = 3  _____(1)

The value of 2x-2y.

= 2x - 2y

Taking 2 as common.

= 2 (x - y)

From (1) we get,

= 2 x 3

= 6

Thus,

The value of 2x - 2y is 6.

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Answer:

[tex]\large\boxed{p<\dfrac{30}{11}\to p\in\left(-\infty,\ \dfrac{30}{11}\right)}[/tex]

Step-by-step explanation:

[tex]-7p-4>26p-94\qquad\text{add}\ 7p\ \text{to both sides}\\\\-7p+7p-4>26p+7p-94\\\\-4>33p-94\qquad\text{add 94 to both sides}\\\\-4+94>33p-94+94\\\\90>33p\qquad\text{divide both sides by 33}\\\\\dfrac{90}{33}>\dfrac{33p}{33}\\\\\dfrac{30}{11}>p\to p<\dfrac{30}{11}[/tex]

Final answer:

The independent variable in the scenario is the time spent baking, and the dependent variable is the number of cookies baked. The size of the oven might be another independent variable if comparing productivity between different bakeries.

Explanation:

In the context of the question where a baker bakes 40 cookies in an hour, we are being asked to identify the dependent and independent variables in this scenario. First, let's define these terms:

In this particular case, the independent variable could be the time spent baking, because it is what the baker controls. The dependent variable is the number of cookies baked, which depends on the amount of time the baker spends baking. If, for example, the baker decides to bake for two hours instead of one, we would expect the number of cookies baked to potentially double, assuming productivity remains constant.

In a different scenario, where comparing the productivity of bakers with different oven sizes – such as a Canadian worker with an industrial-size oven versus a U.S. worker with a smaller oven – the size of the oven could be seen as the independent variable affecting the dependent variable of productivity measured by the output of loaves of bread in an hour.

To calculate f(-5) for the function f(x)=-x+2, we substitute -5 in place of x, which gives us f(-5) = 7.

To find the value of f(-5) for the function f(x)=−x+2, we simply substitute x with -5:

f(-5) = −(-5) + 2

Now, we perform the operations:

f(-5) = 5 + 2

f(-5) = 7

Therefore, the answer is 7.

Answer:

$24.75  

Step-by-step explanation:

Find the unit rate for 1 gallon, to dothis divide $22 by the 8 gallons of gas. 22/8 is $2.75. now that we know the unit rate, multiply it by 9 for our answer. 2.75*9=24.75,the cost for 9 gallons.

Trevin puts 8 gallons of gas in his car and pays $22. The cost of 9 gallons of gas at this rate is $24.75

Word problems in mathematics involve a careful understanding of the question. It is usually written or expressed in one or more sentences and it requires pupils to apply their arithmetic skills to a real-life issue.

From the information given:

i.e

We are to determine the rate he will pay for 9 gallons. i.e.

From the above two expressions, by cross multiplying, we have:

[tex]\mathbf{x = \dfrac{9 \ gallons \times \$22 }{8 \ gallons}}[/tex]

x = $24.75

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