30)
A car dealership sells a car in a basic model (b) the fully-loaded model for $20,000 and $25,000 respectively. During the month
of June, the dealership sells 40 of these cars with sales totaling $880,000. How many of each model does the dealership sell?
Which system of equations matches the situation?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 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)