Given 1 inch - 2.54 centimeters enter the values that will complete this expression for converting 3 5 feet to centimeters​

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

Carley bought a jacket that was discounted 10% off the original price. the expression below represents the discounted price in dollars, based on x, the original price of the jacket.

Ihonestly have no clue if it's each or none.