15 The function f is given by f(I) = 9 . 253. Which of the following is an equivalent form for f (I) ? (A) f(I) = 3-5(z/2) (B) f(x) = 3 . 5(27) (C) f(=) = 9. 5(=/2) (D) f(=) = 9-5(27) 162 Iodine-131 has a half-life of 8 days. In a particular sample, the amount of iodine-131 remaining after d days can be modeled by the function h given by h(d) = Ao(0.5) (/8), where Ap is the amount of iodine-131 in the sample at time d = 0. Which of the following functions & models the amount of iodine-131 remaining after t hours, where Ao is the amount of iodine-131 in the sample at time t = 0 7 (There are 24 hours in a day, so t = 24d.) (A) k(t) = Ao(0.5) (6/24) (B) k(t) = Ao (0.5(1/24) ) (8) (C) k(t) = Ao (0.5(24) ) (t/8) ((267/1) 5"0) OV = (7)9 (@) 170 The value, in millions of dollars, of transactions processed by an online payment platform is modeled by the function M. The value is expected to increase by 6.1% each quarter of a year. At time t = 0 years, 54 million dollars of transactions were processed. If t is measured in years, which of the following is an expression for M (t) ? (Note: A quarter is one fourth of a year.) (A) 54(0.061)(*/4) (B) 54(0.061) (4) (C) 54(1.061) (+/4) (D) 54(1.061) (42)