7x^2-3x - (3x^2 +4x -5) multiply negative one across the entire second term
7x^2 - 3x -3x^2 -4x +5
4x^2 -7x +5
The price was $824.85 before the discount (yesterday)
Go ask your professor for advice it is much better for any normal person
5/6 is not the definite ratio, when you take a larger sample size it could be off by a bit like 499/600 or 501/600
