What are the multiples of 3 and 7 out of numbers 1-20

Need showing work for this problem 56.25 ×25.80

Which expression is equivalent to 64 - 9x^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?