Somehow the bookstore was able to sell 2 copies of its worst seller, Algebra for the Holidays!, at the full price. They then had to sell the remaining 3 copies at one forth the full price just to get rid of them. If the bookstore’s total sales price for this book (discounted and full-priced versions combined) were $55, what did the book sell for at full price?

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)