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4 years ago

Need help right now Not really but please

Mathematics

2 answers:

Dafna1 [17]4 years ago

6 0

Mean is when you take all the numbers and add them together and divide by the amount of numbers there

Example: Find the mean of :3,4,6,7

So you a 3+4+6+7=20 divide that by 4(because there you added 4 numbers) and that equals 5

Fudgin [204]4 years ago

6 0

Your first picture would be 148.8

For the second picture could you retake it. It says there are four bicycles and it looks like the table graph has more bikes and costs but I can't see it, so could you scroll it down, so I could see the graph please.

For the third picture it would be 15

You find the mean by adding up all the numbers and dividing your sum by all the amount of numbers they give you

For example, the third one.

It says find the mean of 2, 6, 8, 10, and 49

That means to add all those together, which is 75

Then, you would divide 75 by 5 because they give you 5 numbers

Those 5 numbers are 2, 6, 8, 10 and 49

75/5= 15

Hope this helps :)

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Which equation represents the function shown on the graph? y=1/4x y=1/2x y=2x y=4x

Alexus [3.1K]

Y=4x. y=mx+b m=slope b=y intercept m=4 because it goes up 4 over 1 and 4/1=4 b=0 because it started at 0, making the equation y=4x+0 or just y=4x

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3 years ago

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How many quarts does the faucet leak per hour?

Citrus2011 [14]

Answer) -5/2 quarts per hour
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3 years ago

3x+1 = y 2x+3y = 14 please explain the steps if you can as well

Likurg_2 [28]

3x + 1 = y
2x + 3y = 14

To solve this system of equations, we are going to use the substitution method. Substitution the equation where the variable is isolated into the second equation. In this system of equations, y is isolated, so we will replace y in the second equation with 3x + 1.

2x + 3y = 14
2x + 3(3x + 1) = 14
2x + 9x + 3 = 14
We will add the like terms and subtract 3 from both sides of the equation.
11x + 3 = 14
11x = 11
x = 1
In this system of equations, x is equal to 1. Now we will go back and solve for y, plugging in 1 for x.
3(1) + 1 = y
2(1) + 3y = 14

3 + 1 = y
2 + 3y = 14

4 = y
3y = 2

4 = y
4 = y

The solution to this system of equations is (1, 4).

8 0

4 years ago

There is an alien machine which produces seven aliens every two seconds. At this rate how many aliens will produces in one hour?

lyudmila [28]

Well, there are 60 minutes in 1 hour, and there are 60 seconds in 1 minute, so in 60 minutes, there are 60 * 60 seconds, or 3600 seconds in 60 minutes, or 1 hour, therefore, in 1 hour there are 3600 seconds.

the machine makes 7 aliens in 2 seconds, how many will it make in 3600 seconds?

$\bf \begin{array}{ccll}
aliens&seconds\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
7&2\\
a&3600
\end{array}\implies \cfrac{7}{a}=\cfrac{2}{3600}\implies \cfrac{7\cdot 3600}{2}=a$

that many.

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3 years ago

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Find the variance of the set of data to the nearest tenth: 5, 8, 2, 9, 4

Orlov [11]

Answer:

Therefore the variance on the data set is 8.3

Step-by-step explanation:

In order to find the variance of the set of data we first need to calculate the mean of the set, which is given by:

mean = sum of each element / number of elements

mean = (5 + 8 + 2 + 9 + 4)/5 = 5.6

We can now find the variance by applying the following formula:

$s^{2} = \frac{\sum_{(i=1)}^n(x_i - mean)^2}{n -1}$

So applying the data from the problem we have:

s² = [(5 - 5.6)² + (8 - 5.6)² + (2 - 5.6)² + (9 - 5.6)² + (4 - 5.6)²]/(5 - 1)

s² = [(-0.6)² + (2.4)² + (-3.6)² + (3.4)² + (-1.6)²]/4

s² = [0.36 + 5.76 + 12.96 + 11.56 + 2.56]/4 = 8.3

Therefore the variance on the data set is 8.3

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3 years ago