Adam was going to sell all of his stamp collection to buy a video game. After selling half of them he changed his mind and did not sell the rest. He then bought ten more, How many did he start with if he now has 31?

Prove that acceleration is perpendicular to velocity

A block of wood is 7 inches long, 2 inches wide, and 3 inches high. What is the volume of this block of wood? 14 in3 42 in3 49 in3 147 in3

Solve the system of equations. 2x - 2y = 6 3x + 2y = 9 A. x=0, y=3 B. x=3, y=0 C. x=1, y=-2 D. x=-2, y=-1

Mix 2parts red with 3parts cream and 1part blue how much cream and blue paint do i need to mix with 4litres of red

Rider dribbles the ball down 1/3 of the basketball court on the first day of practice. Each day after that he dribbled 1/3 of the way more than he did day before. Draw number line to represent the court.

A cafeteria has two sodas. On machine has the following flavors: cola, root beer, and lime. The second machine has a lemon, orange, cola, and cherry. Which set represents all flavors in the two machines?

Mackenzie deposited $68 into a bank account that earned 4.3%

Can 21 go into 30 how many times

school buses use diesel fuel, which is an efficient and clean form of petroleum. One school has 60 buses. Each school bus carries 34 students. if all of the school buses are full how many students are on the school buses

Where is 10 in the real number system