Toshiba wants to administer a satisfaction survey to its current customers. Using their customer​ database, the company randomly selects 70 customers and asks them about their level of satisfaction with the company

Evaluate the expression for the given value of the variable 7a - 4a for a =8

How is this equation completed? i cannot find any examples in the book.

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?