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3 years ago

A rectangular solid has sides of 7 cm, 9 cm, and 11 cm. What is its surface area?

Mathematics

1 answer:

otez555 [7]3 years ago

7 0

Answer:

Surface area is, 478 square centimeter

Step-by-step explanation:

Surface area (S)of rectangle is given by:

$S = 2(lw+wh+hl)$ .....[1]

where,

l is the length

w is the width

h is the height of the rectangle respectively.

As per the statement:

A rectangular solid has sides of 7 cm, 9 cm, and 11 cm

⇒ l = 7 cm , w = 9 cm and h = 11 cm

Substitute in [1] we have;

$S = 2(7 \cdot 9+9 \cdot 11+11 \cdot 7)$

⇒ $S = 2(63+99+77) = 2 \cdot 239 = 478 cm^2$

Therefore, the surface area is, 478 square centimeter

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Step-by-step explanation:

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4 years ago

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Answer:

E) we will use t- distribution because is un-known,n<30

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Step-by-step explanation:

Step:-1

Given sample size is n = 23<30 mortgage institutions

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the degree of freedom = n-1 = 23-1=22

99% of confidence intervals $t_{0.01} =2.82$ (from tabulated value).

$The mean value = 0.0365$

$x±t_{0.01} \frac{S}{\sqrt{n-1} }$

$0.0365±2.82 \frac{0.0046}{\sqrt{23-1} }$

$0.0365±2.82 \frac{0.0046}{\sqrt{22} }$

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using calculator

$0.0365±0.00276$

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Answer:-

using t- distribution because is unknown,n<30,and the interest rates are not normally distributed.

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3 years ago