Solve for the indicated variable
k = a - y; y

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?