Shopping Two friends shop for fresh fruit. Elena buys a watermelon for $6.25 and 3 pounds of chemies. Taniy buys a pineapple for $4.15 and 2 pounds of cheries. Use the variable p to represent the price, in dollars, per pound of cherries. Write and simplify an expression to represent how much more Elena spent
The expression represents how much more Elena spent than Taniy
(Simplify your answer. Use integers or decimals for any numbers in the expression)

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)