Over the summer, alexis read 15 books in 12 weeks. the diagram below can be used to track her progress. if alexis read at the same rate each week, how many books had she read in 4 weeks? in 8 weeks? complete the diagram

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)