Help with this plz which one is it :(((:);(((

Find the maximum value of p= 4x + 5y subject to the following constraints :

D. in a discrete probability distribution, the sum of the probabilities for the discrete variables will be > 1. true or false

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?