Is 3x^3-12x a difference of squares​

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

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?

Ineed ! i can’t figure out this graph