I need help, I will Mark u as the brainiest answer!?

c

Step-by-step explanation:

it's not a function bc the x values have more than one y value between 1-3

“The X-values between 1 and 3 are paired with multiple y-values”

Step-by-step explanation:

If a graph has an x value, it can only have one y value or it is not a function. (must be a straight line to be a function).

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

hope this !