What’s the total surface area of the cylinder?

is only a line? i think so

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation:

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation:

english maybe i can ..