How do you find the missing measurements of each sphere?

Question

anonymous · Answer

I need to answer 5 of them for homework

anonymous · Answer

For 19, I need to find the volume. The radius is 6.5 in and the surface area is 169π in^2. For 20, I need to find the surface area. The volume is 1873.24π m^3 and the radius is 11.2 m. For 21, I need to find both the volume and surface area. The diameter is 6.8 yd. Lastly, for 22, I need to find the radius and surface area. The diameter is 22 in.

cwrw238 · Answer

here are the formula you need

Surface Are = 4 pi r^2

Volume = (4/3) pi r^3

anonymous · Answer

oh okay i don't know much about it so yeah :|

anonymous · Answer

*didn't

cwrw238 · Answer

so to find these values you only need to know the radius
If you are given the diameter then the radius is half of diameter

anonymous · Answer

Oh okay

cwrw238 · Answer

so for example  22

radius 22/2 = 11 yd
and Surface area = 4 *pi*11^2