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Mathematics, 19.07.2019 08:30 Ashleymsmith

Determine wether or not tye following ratios are proportional. 7 inches in 9 hours; 42 inches in 54 hours?

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Answers: 1
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Answer from: Quest

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

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Determine wether or not tye following ratios are proportional. 7 inches in 9 hours; 42 inches in 54...

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