Select the relation that is a function. a. {(21, 11), (21, 10), (21, 9), (21, 8)} c. {(-6, -5), (3, 2), (10, 8), (3, 3)} b. {(-2, -, -1), (16, 3), (-3, -9)} d. {(5, 10), (-3, 10), (-3, -10), (4, 7)} select the best answer from the choices provided a b c d

answer:

step-by-step explanation:

{(21, 11), (21, 10), (21, 9), (21, 8)} c. {(-6, -5), (3, 2), (10, 8), (3, 3)} b. {(-2, -, -1), (16, 3), (-3, -9)} d. {(5, 10), (-3, 10), (-3, -10), (4, 7)}

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation: