Which comparison of these elevations is true? Amsterdam: O feet Colombo: 23 feet Boston: 20 feet O A. Colombo is at a lower altitude than Boston. O B. Amsterdam is at a higher altitude than Boston. OC. Colombo is at a higher altitude than Boston. O D. Boston is at a lower altitude than Amsterdam. ​

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