Question

what is a function rule for the volume of a cylinder with a height of 3 in. more than 4 times the radius of the cylinders base. what is the volume of the cylinder when it has a radius of 2 in ?

Answer 1

Let's start with the relation between the height, h, and the radius, r.

Answer 2

What formula expresses the idea, "a height of 3 in. more than 4 times the radius"?

Answer 3

h = what function of r?

Answer 4

4

Answer 5

What operation goes with "times" ?

Answer 6

multiplication

Answer 7

Yes. So 4 * r

Answer 8

Then what do we do with the 3?

Answer 9

...add, subtract, multiply, or divide?

Answer 10

multiply

Answer 11

No, we add

Answer 12

So h = 4 * r + 3