The price of a visit to the dentist is \$50$50dollar sign, 50. if the dentist fills any cavities, an additional charge of \$100$100dollar sign, 100 per cavity gets added to the bill. if the dentist finds nnn cavities, what will the cost of the visit be? write your answer as an expression.

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)