2x-9y=-25, -2x-9y=-23 in elimination method

Step-by-step explanation:

    -2x-9y=-25

+   -2x-9y=-23

    0 + 0 = -48

          0 = -48

This statement is false, therefore this system has no solution.

idek

step-by-step explanation:

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204