A jar of coins contains pennies, nickels, and dimes. The total number of coins is 13 and the total value is $0.46. How many of each coin are there?

The circumference of a circle is 5 pi cm. what is the area of the circle?

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?

Aculture started with 3000 bacteria. after 5 hours it grew to 3900 bacteria. predict how many bacteria will be present after 9 hours