Regina tested the average time Gold Brand batteries last. She tested 90 batteries. Identify the population, parameter, sample, and statistic of interest in this situation.

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point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.

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