3) If f() = x and g(x) = 3x + 1, then g(f(2)= ?
1)
A)
4
B)
7
13
D)
28

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.

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.