Can you please tell me how to do easy way can you please show me in numbers how to multiply

Solve this and show you’re work step by step ! -5 3/4+3h< 9 1/4 -

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

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)