A manufacturing firm wants to package its product in a cylindrical container 1 ft. high with surface area 4 ft? What should the radius of the circular top and bottom be? What is the radius?

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.