Write the expression in standard form by collecting like terms:

12( 1 - 3a) +8 (a + b)

(a.) 12a + 8b + 28

(b.) -28a + 8b + 12

(c.) 28a - 8b - 12

(d.) 16a + 8b

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?