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3 years ago

First the surface area of the cube. Round to the nearest whole number and the next one after that pllzzzzz

Mathematics

1 answer:

dezoksy [38]3 years ago

7 0

To find a surface area of a cube you want to find the area of ONE side first. Since we know that the area of a square is $s^{2}$ , and we know that the side is 8.5, we can square it.

$8.5^{2}$ = 72.25

Since the area of one side is 72.25, and the number of sides in a cube is 6, we should multiply 72.25 by 6

=433.5

Your answer for the first problem should be 433.5 if I am not mistaken.

The second problem simply asks to write the fraction as a repeating decimal

17/7 = <span>2.428571428571

We can see that the decimal digits of 428571 repeats, you would put the bar over it. Good luck!</span>

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A sample of 5 buttons is randomly selected and the following diameters are measured in inches. Give a point estimate for the pop

Helen [10]

Answer:

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

But we need to calculate the mean with the following formula:

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

And replacing we got:

$\bar X = \frac{ 1.04+1.00+1.13+1.08+1.11}{5}= 1.072$

And for the sample variance we have:

$s^2 = \frac{(1.04-1.072)^2 +(1.00-1.072)^2 +(1.13-1.072)^2 +(1.08-1.072)^2 +(1.11-1.072)^2}{5-1}= 0.00277\ approx 0.003$

And thi is the best estimator for the population variance since is an unbiased estimator od the population variance $\sigma^2$

$E(s^2) = \sigma^2$

Step-by-step explanation:

For this case we have the following data:

1.04,1.00,1.13,1.08,1.11

And in order to estimate the population variance we can use the sample variance formula:

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

But we need to calculate the mean with the following formula:

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

And replacing we got:

$\bar X = \frac{ 1.04+1.00+1.13+1.08+1.11}{5}= 1.072$

And for the sample variance we have:

$s^2 = \frac{(1.04-1.072)^2 +(1.00-1.072)^2 +(1.13-1.072)^2 +(1.08-1.072)^2 +(1.11-1.072)^2}{5-1}= 0.00277\ approx 0.003$

And thi is the best estimator for the population variance since is an unbiased estimator od the population variance $\sigma^2$

$E(s^2) = \sigma^2$

3 0

3 years ago

Find the truth set of 2x-6≤5(3-x)

garri49 [273]

Answer:

x∈(-∞,3]

Step-by-step explanation:

2x-6<=5*3-5x

2x-6<=15-5x

+5x +5x

7x-6<=15

+6 +6

7x<=21

:7 :7

x<=3

x∈(-∞,3]

4 0

3 years ago

The coefficient of xy in the product of (4x2 + 2y) and (3x + y2) is

dedylja [7]

(4x2 + 2y)(3x+y^2)

= 12x^3 + 4x^2y^2 + 6xy + 2y^3

coefficient of xy is ----> 6

8 0

4 years ago

Read 2 more answers

Bad White [126]

first polygon

ext. angle=180°-120°

=60°

$ext \: ang = \frac{360}{n}$

n=360°/60°

n=6

second polygon

n=2(6)=12

ext. ang= 360°/n = 360°/12° = 30°

int. ang = 180°-30°= 150°

answer is C

6 0

3 years ago

Algebra 1B:<br>x/13 + 29 = -36

d1i1m1o1n [39]

Answer:

Solve for x by simplifying both sides of the equation, then isolating the variable.

x=−845

Step-by-step explanation:

3 0

3 years ago