Which situation can be modeled by an exponential function? A. Photos cost $0.08 each.
B. The population of a town increases by 3% each year
.
C. The pay for an employee is $12.25 an hour plus 5% sales commission.
D. The number of gallons of water in a tank decreases by 52 gallons each day.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)