An electrician charges $40 per hour plus an initial service fee of $75. He charges a customer $195 for 3 hours of work. When this linear relationship is graphed, which value represents the slope?

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

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

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step-by-step explanation:

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