June needed 1 1/2 spoons of lemon juice to make a lemon cake. How much lemon juice would she need to make 4 lemon cakes? CLUE: MULTIPLY 1 1/2 X 4/1 = FIRST: do MAD with 1 1/2 to create an improper fraction. SECOND: multiply the improper fraction and the 4/1

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)