Millie and kim both entered a pumpkins in the county fair. Millie's pumpkin weighs 52 1/4 lbs. Kim's pumpkin is 90% as big as Millie's pumpkin. How much does Kim's pumpkin weigh?

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)