7- y + 5y = 9
Two step equation.

y=1/2

Step-by-step explanation:

7- y + 5y = 9

7+4y=9

4y=2

y=2/4

y=1/2

if you have any questions about how to solve it let me know

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