Ok so i attached the question.

x+y=90

x=30-y=x

step-by-step explanation:

if you understand you will get the answer

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

if you are looking for the unit rate then the answer would be 9 because unit rate is distance divided by time.

step-by-step explanation: