What is the equation in point slope form of the line passing through (-1,3) and (1,7)

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

You are at a restaurant and owe $56.20 for your meal. you want to leave an 18% tip. approximately how much is your tip?