U should get the app "photomath" it will help u out alot!!!
Step1. find the how much he buy he buy 45
step2. find the % the % is 4 move to decimal left 4% which is .04
step3. multilply the how much he buy or the % so this is that 45*.04=1.8
step4. what are they said they said tax is like add so we got 1.8+$45=46.8
so the answer is 46.8
look at what is the step and you understand the problem more easy way.
Go up six on the y intercept. Then from 6 go up 1 and over 4.
The answer is A. 2x^2+11x^3+12x^2-10x-8
