How do I find the missing lengths?

By knowing the formulas for the volume of the solids.

Step-by-step explanation:

To find it out, you need to know the formula for the solids shown such as the cone and the cylinder. The formula for the cone is 1/3hπr². The formula for the cylinder is hπr².

If you were asking for the answers,

Cone:

The radius for the cone is 12 inches.

Cylinder:

The height for the cylinder is 3.8 inches.

5x + 5

step-by-step explanation:

you should always add the diagrams and graphs we cannot see. this particular question is kind of borderline because we can make a graph for you.

(f + g)x = -x^2 +3x + 5 + x^2 + 2x

(f + g)x = 5x + 5

the graph of z = 5x + 5 is shown below. always use desmos when in doubt.