Use addition properties and strategies to find the sum of 13 + 47 + 21 + 79 =

There are white, blue, and red boats in a marina. Two-thirds of the boats in the marina are white, 4 7 of the remaining boats are blue, and the rest are red. If there are 15 red boats, how many boats are in the marina?

What is 2 1/4 x 3 2/5?

The (blank) is calculated by putting the data in order and selecting the middle value.

The sum of two numbers is 11. twice the greater number minus the lesser number is 7 what is the greater number

Gloria Trench checked her gas mileage and found that she had used 16.6 gal of gas to travel 372 mi. At this rate, how many gallons will she use to travel from San Francisco to Washington, D. C., a distance of 2,850?

Is 90 a composite number?

Red vases cost $4.20 and clear vases cost $5.70. If 25 vases cost $120 how many of each did i get?

Rapheal is enrolled as a foreign-exchange student. He is from Canada and is going to attend school in Texas. On average he can spend $82 USD each month for the 5 months he is visiting.

It took a skydiver 5 seconds to drop 400 feet. What is the rate (in feet per/second) of the skydiver's drop?

The cost of a camp is $300 for the first week and $125 for each week beyond the first. The total cost can be modeled by the expression 300 + 125 (x - 1). What does (x - 1) represent?