Which expression is equivalent to 9x2 – 2y+ 3x2 – 3y? O 6x2 + 6x2 - 6y
8x2 + 3x - 5y
12x2 – 2y-3y
O 12x2 + 2y-3y

5 • (x + y) • (x - y)

Step-by-step explanation:

answer: i think it is (1,-2)

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