Richard wanted to make snow ice cream. His grandmother’s recipe called for 7 cups of snow. However, when Richard went to make the ice cream his snow melted a little and he ended up having to have 9 cups of snow. What is the percent error of the recipe?

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)