State which relation(s) are functions?
Explain why the other relation(s) are not function

answer: add the !

step-by-step explanation: then we will answer

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)

for this case we have that by definition, the surface area of a cylinder is given by:

where:

r: it is the radius of the cylinder

h: it is the height of the cylinder

we can also rewrite it as:

where:

la: it's the lateral area

ba: area of the base

option a