Question

Which expression represents the volume, in cubic units, of the composite figure?

Answer 1

volume of sphere = 4/3*PI*r^3

volume of cylinder = PI*r^2*h

so combining the 2 equations you would have A as the answer

Answer 2

Answer:

Step-by-step explanation:

Alright, lets get started.

There is a composite figure given with two semi spheres and one cylinder attached.

So the volumes of two semi spheres will form a volume of complete sphere.

So, the volume of sphere = $\frac{4}{3}\pi r^{3}$

The radius is half of 20 means 10, so volume of sphere = $\frac{4}{3}\pi (10)^{3}$

Now the volume of cylinder = $\pi r^2h$

Volume of cylinder = $\pi (10)^2(28)$

So, the volume of composite figure = $\frac{4}{3}\pi(10)^3 + \pi(10)^2(28)$     ...........     Answer

Hope it will help :)