Matt gave half of his books to the local library and kept the other half. his best friend gave him 3 more books. he now has 57 books. how many did he have to start?

/is used for a fraction 1) if x = 2/3 and y = 3/4, what is the value of (x + y) (x/y) expressed as a common fraction? 2) what is the least positive integer greater than 1 that leaves a remainder of 1 when divided by each of 2, 3, 4, 5, 6, 7, 8, and 9? 3) the ponde family's powerjet pumps 420 gallons of water per hour. at this rate, how many gallons of water will it pump in 45 minutes? 4) kim's insurance company pays 80% of the cost of all prescription medication she purchases in a year beyond the first $250 worth of prescriptions. her prescriptions for this year cost a total of $570. how many dollars of this amounts will kim's insurance company pay?

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.