You earned $75.70. you would like to buy some new t-shirts. estimate the number of t-shirts you can buy if each one costs $10.80. 6 t-shirts 9 t-shirts 7 t-shirts 8 t-shirts

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)