State whether each of these functions, where sets a and b are as stated in #1, are one-to-one, onto, both, or neither, and give a brief explanation for each answer feaxb, where f {(r,17), (q, 18), (s, 19), (t, 20)} a. ga x b, where g {(q, 17), (s, 19), (t, 20), (r, 19)} b. c. hc a x b, where h {(q, 18), (r, 20), (s, 18), (t, 20)} b x b, where k {(17,20), (18, 20), (19, 20), (20, 20) d. k 1ca x a, where l = {(q, t), (r, s), (s, q), (t, r)} e.
problems is shown in parentheses. 1. (5) let a = {q, r, s, t} and b={17, 18, 19, 20. determine which of the following are functions. explain why or why not.