For the first problem the sphere with a radius of 16cm the answers is 17157.28
For the cone with a radius of 15 and height of 23, the answer is 5419.25
For the sphere with a radius of 8 the answer is 2144.6
For the cylinder with a radius of 4 and height of 7 the answer is 351.86
And finally for the cone with a radius of 7 and height of 17 the answer is 872.32