Ascuba driver wants to descend at an average rate of at least 7 feet per minute for 5 minutes. the table shows how many feet the scuba driver descends in the first 4 minutes. how many feet must the scuba driver descend in the fifth minute to meet the goal?

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)