Divide

by 5. Or multiply it by 1/5.
You get - 56/25 or

pounds per month.
Changed both of them to a fraction
The given polyn. is not in std. form. To answer this question, we need to perform the indicated operations (mult., addn., subtrn.) first and then arrange the terms of this poly in descending order by powers of x:
P(x) = x(160 - x) - (100x + 500)
When this work has been done, we get P(x) = 160x - x^2 - 100x - 500, or
P(x) = -x^2 + 60x - 500
So, you see, the last term is -500. This means that if x = 0, not only is there no profit, but the company is "in the hole" for $500.
In this problem, the x intercept is 3.5 because the line crosses through the x axis at the point (3.5,0)