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4 years ago

7.

Mathematics

2 answers:

Mumz [18]4 years ago

7 0

D is your answer
XD
have a nice day XD

irina [24]4 years ago

6 0

Answer:

Hello! The answer is a Square Pyramid.

Step-by-step explanation:

This is because a square pyramid or any pyramid have 1 base which could be different shapes, but the other faces are all lateral faces, not bases.

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60 marks out of 75 full marks express in percent

DochEvi [55]

80 percent

Explanation:
Divide 60 by 75 and get the outcome of .80

3 0

3 years ago

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Can someone help me answer questions 10 and 11?

Alexxandr [17]

10. 10
11. -2.8

Hope u enjoyed xD

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4 years ago

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a baby weighs 18 pounds at her four month appointment. six month later she weighs 24 pounds. by what percentage did the baby wei

umka21 [38]

Answer:

yes Dang that baby a thicc boy or girl

Step-by-step explanation:

lol

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3 years ago

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.y=x+2 y = 2x - 5 How do we solve this

otez555 [7]

Answer:

X=7

Y=9

Step-by-step explanation:

.y=x+2

y = 2x - 5

Use equivalents y=y so you get:

X+2=2x-5

X-2x=-5-2

-x=-7

X=7

Y=x+2=7+2=9

5 0

3 years ago

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An investigator compares the durability of two different compounds used in the manufacture of a certain automobile brake lining.

Tanya [424]

Answer:

98% Confidencce Interval is ( 3030.6, 7467.4 )

Step-by-step explanation:

Given that:

Sample size $n_1 =$ 71

Sample size $n_2 =$ 31

Sample mean $\overline x_1 =$ 41628

Sample mean $x_2 =$ 36,379

Population standard deviation $\sigma_1$ = 4934

Population standard deviation $\sigma_2 =$ 4180

At 98% confidence interval level, the level of significcance = 1 - 0.98 = 0.02

Critical value at $z_{0.02/2} = 2.33$

The Margin of Error = $z \times \sqrt{\dfrac{\sigma_1^2}{n_1}+\dfrac{\sigma^2_2}{n_2} }$

= $2.33 \times \sqrt{\dfrac{4934^2}{71}+\dfrac{4180^2}{31} }$

= $2.33 \times \sqrt{\dfrac{24344356}{71}+\dfrac{17472400}{31} }$

= $2.33 \times \sqrt{906504.06 }$

= 2218.40

The Lower limit = $( \overline x_1 - \overline x_2) - (Margin \ of \ error)$

= ( 41628 - 36379 ) - ( 2218.40)

= 5249 - 2218.40

= 3030.6

The upper limit = $( \overline x_1 - \overline x_2) + (Margin \ of \ error)$

= ( 41628 - 36379 ) + ( 2218.40)

= 5249 + 2218.40

= 7467.4

∴ 98% Confidencce Interval is ( 3030.6, 7467.4 )

5 0

4 years ago