Student A: During the period 2000-2015, the sales of cheesecake at Jenna's Cheesecake Company increased by 800 per year. In 2003, Jenna sold 3,620 cheesecakes. Write an equation that gives the annual sales as a function of the number of years since 2000. What was the number of cheesecakes sold in 2015?
Student B: Suppose a one year subscription to a magazine costs $12.99 and a 3 year subscription costs $25.98. The cost and length of the subscription are related. Write an equation to model the cost of a subscription for any period of time. How much should a 5 year subscription cost?
Student C: A hot air balloon descends at a rate of 2 meters per second. After 15 seconds, it is 620 meters off the ground. Write an equation that represents the relationship between the time and the height of the hot air balloon. What is the height of the balloon after 35 seconds?