Ineed figuring out how to get this from 20 people to thirty people.
attached is the problem

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4