problem solving.

Question

Keiko's company makes solid spherical metal balls for various industrial uses. A customer wants aluminum balls that have a diameter of 6in

.If Keiko must make 70

 of these balls, how much aluminum will she need? 

If necessary, refer to the list of geometry formulas.

Answer 1

4/3*r^3pi is the cum/measure.

4/3*3^3pi=113.097cu/in

*70

=7916.81cu/in

Answer 2

ΠA ball with a 6-inch diameter has a radius (call it r) of 3.

Each ball has a volume of (4/3) Π r³. Substitute 3 for r and get a volume of 36Π Π in³.

Keiko needs enough aluminum for 70 balls. 70 * 36 Π = 2520 Π in³.