Antoine went to the store. he paid $3 each for 4 pounds of grapefruit.
when he got home, his mother gave him $7 for some of the grapefruit.
what is the change in the amount of money antoine has?

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !