Answer:
A = 73 , B = 9 , C = 13
Explanation:
the value of A corresponds to x = 8, in the interval x ≤ 10 , then
f(x) = 9x + 1 , that is
f(8) = 9(8) + 1 = 72 + 1 = 73 = A
the value of B corresponds to x = 10, in the interval x > 10 , then
f(x) = 2x - 11 , that is
f(10) = 2(10) - 11 = 20 - 11 = 9 = B
the value of C corresponds to x = 12, in the interval x > 10 , then
f(x) = 2x - 11 , that is
f(12) = 2(12) - 11 = 24 - 11 = 13