Explain how you can estimate the sum of 4/5 and 1/6

Aladder that is 30 ft long needs to reach 27 ft up a building. what should the angle of the vertical be?

Write an equation for the function that includes the points (2,100)and (3,100)

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)