Which equation is quadratic in form? 6(x 2)2 8x 2 1 = 0 6x4 7x2 â€"" 3 = 0 5x6 x4 12 = 0 x9 x3 â€"" 10 = 0.

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)