A salesman buys a coat at a 12.5 percent discount off of 64 dollars. He then sells the coat at a gain of 25 percent of his cost. After allowing a 20 percent discount on the marked price. What is the marked price in dollars of the coat? Please also explain how to get it! Thank you

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

Could somebody me with this radical simplification?

Can you me find the slope! (30 points)