Suppose an exponential function, f(x), models the amount of money in a savings account after x years. What is the most appropriate domain of this function? A. real numbers
B. rational numbers
C. positive integers
D. positive rational numbers

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)