1. i decided to do the first problem on the test for you! get out your red pen! i made a mistake what did i do wrong? explain my mistake and fix it!

The x^6 should be on the bottom because when you attempt to bring x^12 on top, you are essentially doing the equation x^6-x^12 which would equal x^-6 and if you have x^-6, you must bring it down to the denominator so the final answer for question 1 is 27/4x^6y^8

Step-by-step explanation:

23.75 + [(0.18)(23.75)]

Step-by-step explanation:

Ellen plans to leave an 18% tip with her $23.75 lunch bill.

Therefore, to determine her total bill, she use the expression

= 23.75 + ( 18% of 23.75 )

= 23.75 + ( 0.18 × 23.75 )

or 23.75 + [(0.18)(23.75)]

So the expression is 23.75 + [(0.18)(23.75)] to determine her total bill.