Justine purchased a new car this year for $24,250. the car is expected to depreciate at an annual rate of 19%. justine uses the exponential model v(t)=24,250(0.81)^t to predict the value of the car after t years. use the function to predict the value of the car after 8 years. round to the nearest whole dollar.

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)