Somebody report/delete my questions please like ALL my questions thanks

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)

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?