I believe the answer to your question id they first one and its f(x)=3x-3
Search up the book on slader and look up the page number , i do this everytime if you need further explanation let me know
8 . 25 % is equal to 0.0825 as a decimal fraction
Final Bill = 450 + 0.0825 * 450
= $487.13 answer
the answer would be C. because if you add and Subtract and divided you would get 17.