Pls help me with this math problem.

the answer is d

Step-by-step explanation:

C

Step-by-step explanation:

Because a negative times negative equals a positive, and if you look, there is five of them, so you would have at the end, 1 x -1 which would give you -1

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