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3 years ago

What is the volume of the cube?

Mathematics

1 answer:

Lera25 [3.4K]3 years ago

3 0

The volume of a cube is the length of a single side cubed: V=s3 In this case: V=83V=512 So D.
hope this helps

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there are 60 kids who plays soccer 5% of the kids also play chess how many children play both soccer in chess

Mice21 [21]

Answer:

10% (I think)

Step-by-step explanation:

I am not 100% sure that this is correct cause I'm not that good at math if I am hope it helps!

8 0

3 years ago

Bianca puts $10 in a savings account each month and an extra $20 when she receives money for her birthda If her birthday was thi

german

The expression should look something like 10x+20.

8 0

3 years ago

What is the answer to this equation 5X + 4 = 49

Mrrafil [7]

Okay -

So, the goal when we have an equation is to find the value of the variable. So, let's isolate that variable on one side of the equation!

* original equation 
5x + 4 = 49.

* subtract four from both sides. if you do something on one side of the equation, you have to do it on the other.
5x + 4 - 4 = 49 - 4.

* now we are going to divide 5 on both sides to isolate x.
5x/5 = 45/5.

* and our answer is...
x = 9. =)

3 0

3 years ago

Read 2 more answers

The mean waiting time at the drive-through of a fast-food restaurant from the time the food is ordered to when it is received is

alexira [117]

Answer:

a) And if we replace we got: $\bar X= 78$

$s = 15.391$

b) $78-3.25\frac{15.391}{\sqrt{10}}=62.182$

$78-3.25\frac{15.391}{\sqrt{10}}=93.818$

So on this case the 99% confidence interval would be given by (62.182;93.818)

Step-by-step explanation:

Dataset given: 109 67 58 76 65 80 96 86 71 72

Part a

For this case we can calculate the sample mean with the following formula:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}$

And if we replace we got: $\bar X= 78$

And the deviation is given by:

$s =\sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}$

And if we replace we got $s = 15.391$

Part b

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=10-1=9$

Since the Confidence is 0.99 or 99%, the value of $\alpha=0.01$ and $\alpha/2 =0.005$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.005,9)".And we see that $t_{\alpha/2}=3.25$