36 . If x^2 − 7y = 8, x − y = 1, and y > 0, what is the value of y?
(A) 1.64
(B) 4.78
(C) 5.64
(D) 6.14
(E) 7.28
37 . If for x ≥ 8, then for the values x of its domain, f−1(x) =
(A) 8(7x)
(B) 7(8x)
(C) 8(7x+1)
(D)
(E)
38 . If x 1 = 2 and , then x 4 =