20 which relation is a function? a. {(−2, 1), (−7, −1), (2,  8), (−7, −8)} b. {(−2, 2), (−7, 7), (−1,  1), (−8, 8)} c. {(−2, 1), (−2, 2), (−2,  7), (−2, 8)} d. {(1, −7), (2, −8), (−2,  7), (1, 8)}

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6

you have to put the graph on here with the question

step-by-step explanation: