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3 years ago

Which of these shapes have the same perimeter

Mathematics

1 answer:

Snezhnost [94]3 years ago

5 0

Answer:

A) B and C

Step-by-step explanation:

To find the perimeter, add up the lengths of all the sides.

For shape A: 16+16+1+1= 34

For shape B: 8+8+2+2= 20

For shape C: 5+5+5+5= 20

Shapes B and C both have a perimeter of 20. The answer is A, B and C.

I hope this helps!

___________________________________________________________

The other answer is not correct because they are finding the area of the rectangles.

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AfilCa [17]

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3 years ago

What is .00000786 in scientific notation

Bas_tet [7]

Sorry that I don't have the answer. Hope this helps!

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3 years ago

Read 2 more answers

I need help with #10 please! Thanks!

Anastasy [175]

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4 years ago

An engineer is comparing voltages for two types of batteries (K and Q) using a sample of 72 type K batteries and a sample of 49

rewona [7]

Answer:

Given:

For battery k(sample 1):

Sample size, n = 75

Sample mean, X' = 9.41

Standard deviation = 0.723

Mean u1 =???

For battery Q(sample 2):

Sample size, n = 49

Sample mean, X' = 9.69

Standard deviation = 0.257

Mean u2 =???

Significance level = 0.05

1) The null and alternative hypotheses, will be given as:

H0 : u1 - u2 = 0

H1 : u1 - u2 ≠ 0

2) This is a two tailed test.

For the test statistic, we have :

$Z_o = \frac{X'_1 - X'_2}{\sqrt{\frac{(\sigma_1)^2}{n_1} + \frac{(\sigma_2)^2}{n_2}}}$

$= \frac{9.41 - 9.69}{\sqrt{\frac{(0.723)^2}{75} + \frac{(0.257)^2}{49}}} = - 3.018$

≈ 3.02

The Zo = - 3.02

3) For the p value, using excel, we have:

2 * P(Z > (-3.018))

= 2 * NORMDIST (-3.018, 0, 1, true)

= 0.00254

For critical value:

Zcritical = Za/2 = 0.05/2

Zcritical = 0.025

We have alternative hypothesis,

H1 : u1 - u2 ≠ 0.

Therefore we reject null hypothesis H0 if Zo > Zcritical

4) We reject null hypothesis H0 if Zo > Zcritical. At 0.05 level of significance, there is not enough evidence to conclude that mean u1 and mean u2 are different.

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3 years ago

Can someone help me?

jekas [21]

The answer is three

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3 years ago