Your mom buys 2 nachos and 3 drinks from the concession stand for $12.50. Bixby purchases 2 candy bars and 1 drink for $5.50. Tito buys 1 nacho and 1 candy bar for $5.00. How much does each item cost?

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)