One year ago, Nolan could run a mile in m minutes. Since then, his time has decreased by 9%. Write two different expressions that represent the number of minutes it now takes Nolan to run a mile, and show or explain why the expressions are equivalent​

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?