If f'(x) = 0 at x = -2, 0, and 2 and f"(x) is shown below
then f has a local maximum at x = ?

How are you supposed to figure that out?

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

Mason and christian go to the movie theater and purchase refreshments for their friends. mason spends a total of $45.75 on 3 bags of popcorn and 6 drinks. christian spends a total of $71.50 on 6 bags of popcorn and 4 drinks. write a system of equations that can be used to find the price of one bag of popcorn and the price of one drink. using these equations, determine and state the price of a drink, to the nearest cent.

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?