If a, b, c, d are positive, and if a b < c d , then which statement is ALWAYS true? A) ab < cd.
B) da < bc.
C) bc < ad.
D) cd < ab.

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step-by-step explanation:

english, cause i can’t you

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