Switch where the x and y are, then solve for y. f(x) = y.
x = 3y^2 + 6
x-6 = 3y^2
(x-6)/3 = y^2
f^-1(x) = y = sqrt((x-6)/3)
Answer:
i think 1
remember like this: y=mx+b
m is slope
b is y intercept
10 (13) 15
35 (37) 40
45 (48) 50
60 (61) 65
90 (93) 95