Pick out the like terms. 6x^2 (which equals 36x), 11x, 2x^2 (which equals 4x), -17x.
36+11+4= 51, -17= 34x
-3+-4= -7
The simplified expression would be 34x+-7.
(This could be wrong though, I'm sorry if it is ^^)
To find an unknown number take the end number and add it to the number you already have.
2 + 2 = 4
x = 4
The answer would be 5, because you divide 40 by 8 like they did to get the sides
So your answer would be x-19+0. Let x represent the original price of the stock.