78 * 40 show your work because i need to figure out how to do multiplication like this the long way !

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

Math each whole number with a rational,exponential expression

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)