Question

BROS COME HELP..The radius of the Earth is approximately 3,960 miles. Find the approximate surface-area-to-volume ratio of the Earth.
A.
0.00025
B.
0.00076
C.
1,320
D.
11,880

Answer 1

The radius of the Earth is approximately 3,960 miles. Find the approximate surface-area-to-volume ratio of the Earth.
A.
0.00025
B.
0.00076
C.
1,320
D.
11,880

Answer 2

The volume of a sphere is
\[\frac{ 4 }{ 3 } \pi r ^{3}\]

Answer 3

The surface area of a sphere is
\[4 \pi r ^{2}\]

Answer 4

Divide the surface area by the volume to get
\[\frac{ 1 }{ \frac{ 1 }{ 3 } r}\]

Answer 5

Plug in r = 3,960 miles
so Surface/Volume = .00076
which corresponds to choice B.