Crystal earns $4.50 per hour mowing lawns. write a rule to describe how the amount of money m earned is a function of the number of hours h spent mowing lawns. how much does crystal earn if she works 3 hours and 45 minutes?

Consider the graph of the exponential function y=3(2)×

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?