Any unknown or changeable quantity is called a (n)

Selim puts 1 star sticker on each baseball card of his favorite players. The stickers come 9 to a sheet. Selim has 30 favorite players. How many sheets of stickers does he need to get?

What is the result of converting 0.74 hours into minutes?

Clara drove 248 miles in 4 hours. what was her average rate of speed

If 2.5 pounds of a certain grain cost $1.75, how much will 5.3 pounds of the grain cost?

Estimate the side length of a square that has a 9 cm long diagonal

Determine how far the vehicle travels in 3 hours. A motorcycle travels 25 miles every 0.5 hour. The vehicle travels miles.

It takes a baseball player 16 seconds to round the bases and make it back to home plate home plate if it is 360 feet to go all around the bases then calculate the players average speed

Bruce and Mila are collecting baseball cards from their favorite teams, the Orioles and the Pirates. The equation r+p=28 represents the number of cards Bruce has. The equation 2r+p=43 represents the number of cards Mila has.

Kyra has a manufacturer's coupon for $5 off a box of diapers and a store coupon for 20% off any purchase. The store will let you use both coupons, but it does not have a policy about which coupon you must use first.

What does r equal? 5 (3-5r) + 3r = - (5r + 2)