Jamie has saved $42 of her allowance money to buy books. if she buys 5 books at d dollars per book, she will have 42-5d of her allowance left. how much does she have left if the books cost $3.50 each?

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?