please assist

a. The following graph represents an exponential function f. ( - 3 , 8 ) 8 9 * ( - 1 2 , 4 ) fac 4 -3 2 1 | 1 2 3 4 i. Write the formula that defines f. f(2) = -15/8x+19/8 * Preview ii. Write the formula that defines f -1. f-(y) = 8x/15+19/15 * Preview b. The following table represents an exponential function g. y = g(x) - 3 216 - 1.2 ~0.116 0 1 6 2 36 i. Write the formula that defines g. g(20) =[ Preview ii. Write the formula that defines g - 1. g (y) = Preview