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A college student earned $8,800 working as a waiter. The student invested some of the money at 7% and the rest at 6%. If the student received a total of $560 in interest at the end of the year, how much was invested at 7%?

If the length of a rectangle is doubled, does the area double? Why or why not?

Eric is in charge of ordering the centerpieces for a school awards banquet. There are three types, which cost $22, $37, and $48. He needs to order some of each for a total of 35 centerpieces and a total cost of $1,355. He needs 6 fewer of the $22 centerpieces than of...