If the diameter of the semicircle is 6 in fid the area in terms of pi?

Add the fractions and simplify 1/2+ 1/3

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)

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.