Me on problems 15 - 20 (need it for tom.)

Sum of the interior angles of a pentagon

If a suspect is in possession of 20 grams of cocaine how many ounces does he possess what will the charge be

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?