All books in a store are being discounted by 30%

part a:
let x represent the regular price of any book in the store. write an expression that can be used to find the sale price of any book in the store.
expression:

part b:
jerome bought a book on sale at the store. the sale price of the book was $8.96. write and solve an equation to determine the regular price of the book to the nearest cent.
expression:

regular price of the book: