Can someone help me with this? It’s dues tomorrow this is for science but there’s no science

(40 points) i need some . an answer definition is appreciated as well.

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

If g^-1(x) is the inverse of g (x) which statement must be true