PLEASE HELP ME The following linear function represents the cost of a home printer plus ink
cartridges where x represents the number of ink cartridges purchased and
y represents the total cost. y = 25x + 115
What is the rate of change, and what does it represent?

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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