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2 years ago

What is the surface area in square inches of a cube with a side 7 inches long? 10

Mathematics

2 answers:

OLga [1]2 years ago

7 0

Answer:

249 inches

Step-by-step explanation:

a cube is equal on all sides so if one side is 7 all sides are 7, if you multiply 7 by 7 you get 49 but that's just one face of the cube, there are 6 faces on a cube so 49 x 6 is 249

SVETLANKA909090 [29]2 years ago

5 0

Answer:

Step-by-step explanation:

7x4

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12R<br> If V= ---- <br> (r+R)<br> Make R the subject of the equation .

k0ka [10]

V= $\frac{12R}{r+R}$
note, r and R are differnt
so multipl both sides by (r+R)
V(r+R)=12R
distribute
Vr+VR=12R
minus VR from both sides
Vr=12R-VR
undistribute R
Vr=R(12-V)
divide both sides by (12-V)
$\frac{Vr}{12-V}=R$ or
$R= \frac{Vr}{12-V}$

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3 years ago

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ohaa [14]

Answer:

Step-by-step explanation:

$A = \frac{1}{8} \pi {r}^{2} (a - 1) \\$

First of all multiply through by 8 to eliminate the fraction

That's

$8A = 8 \times \frac{1}{8} \pi {r}^{2} (a - 1) \\8 A = \pi {r}^{2} (a - 1)$

<u>Divide both sides by πr²</u>

$\frac{8A}{\pi {r}^{2} } = \frac{\pi {r}^{2}(a - 1) }{\pi {r}^{2} } \\ a - 1 = \frac{8A}{\pi {r}^{2} }$

Move 1 to the other side of the equation to make a stand alone

We have the final answer as

$a = \frac{8A}{\pi {r}^{2} } + 1 \\$

Hope this helps you

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brilliants [131]

Answer:

Step-by-step explanation:

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