I need help with 4th grade math please. thank you so much.

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

Solve -2(4y + 6) = 52. 5 -5 8 -8 and !

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)