A function whose domain is the set of positive consecutive integers forms a
sequence. The terms of the sequence are the range values of the function. For
the sequence 4, 7, 10, 13, ..., f(1) = 4, f(2)= 7, f(3) = 10, and f(4) = 13.
7. Consider the sequence -4, -2, 0, 2, 4, 6, 8, ....
a. What is f(3)?
b. What is f(7)?