Two cars leave the same parking lot, with one heading south and the other heading east. After several minutes, the southbound car has traveled 15 miles, and the eastbound car has traveled 20 miles. Measured in a straight line, how far apart are the two cars?

Aschool typically sells 500 yearbooks each year for 50 dollars each. the economic calls does a project and discovers that they can sell 100 more yearbooks for every $5 decrease in price. the revenue for yearbook sales is equal to the number of yearbooks sold times the price of the yearbook. let x represent the number of $5 decrease in price. if the expression that represents the revenue is written in the form r(x)=(500+ax)(50-bx). to maximize profit, what price should the school charge for the yearbooks? what is the possible maximum revenue? if the school attains the maximum revenue, how many yearbooks will they sell?

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?

The length of a lap is 15 meters. if lisa wants to swim 450 meters this week, how many laps must she swim