Please Help I’ll give brainlist for correct answer Evaluate the expression

If p = 1, r=-7, and s= -2
-3p-21 6+4s

A. -5 1/2
B. -11/3
C. 11/14
D. 4 1/2

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?