Which equation has a constant of proportionality equal to 1? Choose 1 Choose 1 (Choice A) A y=\dfrac{10}{11}xy= 11 10 ​ xy, equals, start fraction, 10, divided by, 11, end fraction, x (Choice B) B y=\dfrac{7}{8}xy= 8 7 ​ xy, equals, start fraction, 7, divided by, 8, end fraction, x (Choice C) C y=\dfrac{3}{15}xy= 15 3 ​ xy, equals, start fraction, 3, divided by, 15, end fraction, x (Choice D) D y=xy=x

4

step-by-step explanation:

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step-by-step explanation:

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