Which expression is equivalent to -2(3a + 6b) + (4a - 2b)? a) -2(a + 7b) b) -2(a - 7b) c) 2(a + 7b) d) 2(a - 7b)

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?