8. Suppose that y varies inversely with x. Use the information to find k, and then choose the equation of variation. x = 1.2 when y = 3. k = 0.4, y = 0.4x o k=36, Y = K = 0.4, y = X k= 3.6, y = 3.6x HELP!!!​

(w – 2.5)(w + 2.5)

(–4v – 9)(–4v + 9)

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

step-by-step explanation:

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