4.Martha was supposed to work 5 hours making $9.50 an hour. Instead she decided to go to a concert which costs her $25 in gas and $50 for the ticket. What is her opportunity cost?

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.

Kevin's bank offered him a 4.5% interest rate for his mortgage. if he purchases 3 points, what will be his new rate?

One positive integer is 2 less than another. the product of the two integers is 24. what are the integers?