I am trying to find what value X needs to be to make the maximum value for Y, but I am not sure how to do that!
Code:X | Y --------- 0.6 | 1112 0.7 | 1113.5 0.8 | 1107
That is the equation I drew up. I need to know what X needs to be so that Y is as high of a number as possible.Code:( 80(1-x) + 107 )( 5x + 5 ) = y
If X = 0.66 then Y = 1113.86
If X = 0.67 then Y = 1113.89
If X = 0.68 then Y = 1113.84
So I know the answer is somewhere between 0.66 and 0.67
Okay, so let me ask you the following... Your problem boils down to finding the maximum of $\displaystyle y = -400x^2 + 535x + 935$. This is a parabola that opens downward, so it has a maximum. The maximum will lie on the axis of symmetry of the parabola and is, in fact, at the vertex. Can you find the vertex of this parabola?
-Dan