The amount of radioactive uranium changes with time. the abscissas and ordinates of the points given are the time and amoung of radioactive uranimum, respectively. (0, 100), (0.5, 50) (1, 25). which exponential function best represents the relationship between f(t) and t? a. f(t) = 100(0.25)t b. f(t) = 0.25(100)t c. f(t) = 100 (0.5)t d. f(t) = 0.25(50)t