Idon’t get this problem right here if anyone me out just tell me what to press : ) 7 1/5-6 2/5=?

If the measure of xyz is 81 what is the measure of yz

What is x3+3x2−16x−48 divided by x−1?

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)