Sarah backstrokes at an average speed of 8 m/s. how long will it take her to complete the race of 200 meters length?

Simplify.7x + 3y - 2 + 6x + 1 + y squared 2 you! ; )

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?