Jason works at least 5 hours but not more than 10. he earns $15.00 per hour. the function f(t)=15t represents the money he earns for working t hours. what is the practical range? show all your work!

Becca wants to mix fruit juice and soda to make a punch. she can buy fruit juice for $3 a gallon and soda for $4 a gallon. if she wants to make 28 gallons of punch at a cost of $3.25 a gallon, how many gallons of fruit juice and how many gallons of soda should she buy?