Find the area of the surface of the half cylinder startset left parenthesis r comma theta comma z right parenthesis : r equals 4 comma 0 less than or equals theta less than or equals pi comma 0 less than or equals z less than or equals 9 endset using a parametric description of the surface.

nothjing

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

you have orange juice on wednesday. (idk why this is the answer)

step-by-step explanation: