12. The function h is given by h(x) =9.4(2). Which of the following is an equivalent form for h(x) ? (A) h(x) = 6-2' (B) h(x) =9-2* (C) h(x) =18-2' (D) h(x)=9-16' 13. The function & is given by k(x) = a .4', where a is a positive constant. Which of the following is an equivalent form for k (x) ? (A) k(x) = a-2(*/2) (B) k(x) = a2. 2(*/2) (C) k(x) =a-16(*/2) (D) k(x) =a2-16(*/2) 14. Which of the following functions is an equivalent form of the function p(x) = 3-2x ? (A) P(x) =-(9)" (B) p(x) =9 (C) P(x)=-( !) (D) P(x) =(- 15. The function m is given by m(x) =8.9(*/). Which of the following is an equivalent form for m (x)? (A) m(x) = 2.3' (B) m(x) =2.(19) (C) m(x) =8.3* (D) m(x) =8.(19)