8.5, 8.409, 8.47, 8.357, 8.41, 8.458

LESS GREATER HELP ASAP

What is the quadric regression equation that fits these data

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

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)