Out of 250 racers who started the marathon, 231 completed the race, 13 gave up, and 6 were disqualified. what percentage did not complete the marathon?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.