Question

As part of a school science project, Caroline needs to make a model of planet Earth with a 7-inch diameter using playdough. If one container of playdough contains 9 cubic inches, how many containers will she need?

Answer 1

What do you think you need to do?
Divide Or Multipy the 7 and 9?

Answer 2

I'm not sure.

Answer 3

We first have to find volume of the sphere
\[\frac {4} {3} \pi r^3\]

Answer 4

So diameter is 2 times radius so the radius in this question is...?

Answer 5

3.5?

Answer 6

Yep so we have \[\frac {4} {3} \pi ~(3.5^3)\]
can you find the decimal form of that?

Answer 7

178.76?

Answer 8

I got 179.59 approximately-?

Answer 9

Oh- Okay I see now.

Answer 10

So then divide that by 9, and round to the next whole number, even if it isn't supposed to round up, theoretically

Answer 11

If its rounded up would it be 20?

Answer 12

yep, so your answer is 20

Answer 13

Thank you again (:

Answer 14

yw~ xd