8. (5 points) For the following functions, determine (f + 9)(-1), (f -9)(-1), and (fg)(-1). f(c) = 2 " 9(x) = 6x 9. (5 points) For the following functions, determine the formula and domain for f + g and -. f(x) = x2 -1, g(2) = VI 10. (5 points) For the following functions, determine the formula and domain for fog and go f. f(z) = VI-1, 9(2)= =+1 11. (5 points) Suppose that f(x) = 12 and (go f) (1) = v-12 +5 + 4. Determine g(I). 4