IT SAYS UPLOAD A VIDEO OF YOU BUT DONT)Can someone actually do what it says and tell me please!

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)

How do your peer relationships affect your overall health status? what can you do to improve your peer relationships?

Determine if the equation defines y as a function of x: 2xy = 1. yes o no