Two grocery stores are having deals on tomatoes. Sally's Grocery is selling 10 tomatoes for $6.30. Sweet Supermarket is selling 7 tomatoes for $5.10. Which store is offering the lower unit price? You know the price of 7 tomatoes at Sweet Supermarket, so you can find the price of 7 tomatoes at Sally's Grocery to compare. First, find the unit price at Sally's Grocery.
Sally's Grocery

Tomatoes Price
10 $6.30
1 $
0.63
Great job!
Now find how much 7 tomatoes would cost at Sally's Grocery, the same amount of tomatoes in the deal at Sweet Supermarket.

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)