An airplane has descended 4,000 feet before landing. The integer that represents how many feet the airplane was above the ground before its descent is

Cam bought some used books for $4.95. he paid $0.50 each for some books and $0.35 each for the others. he bought fewer than 8 books at each price. how many books did cam buy?

If i have 20$ and i gave 5$ away how much i got

Which number completes the inequality? 2/3 < _ < 7/9