This has to be done within a hour, and I’m really stuck

Average salary for a medical assistant is $31,220 which is a 20% income tax bracket how much money would they pay in income tax?

On a architect's drawing of a house, 1 inche representa 1.5

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)