which set or sets does the number 21 belong to

3. Kylie has 14 polished stones. Her friend gives her 6 more stones. Write an expression to match the words.

Currently, I am 9 times as old as my son. Next year, I will be 7 times as old as my son. How old is my son now?

Person a has a large van that gets 15 miles per gallon and person b a small car that gets 30 miles per gallon. A drives 150 miles and B 50 miles per week. They decide that they can afford to buy both. What vehicle would the save the most money

Marcie lends money to her brother for nine months. How much interest does she earn on $500 at 3 and 3/8 percent simple interest?

Solve and check the inequality, if possible. |8m + 4| < 12

The cost for 7 dance lessons is $82. the cost for 11 is $122. write a linear equations to find the total cost C for L dance lessons. How much for 4 lessons?

What is 9.09 repeating as a fraction?

The number of gallons of water in a tank that already has 300 gallons in it after being filled at 35 gallons per minute for m minutes

The Tennis Teams of Atlanta need to older tennis balla for the upcoming tournament. They will need 2,367 tennis balls. If each can hold 5 tennis balls, how Many will they purchase

42 is subtracted from 42% of a number. The result is 42. What is the number?