Wally the weightlifting wonder has been training all season. eat, sleep, weightlift, repeat. At the beginning of the season he could lift 560 pounds. over the course of the weightlifting season he increased that by 45%. how much can he lift now?
A).792 pounds C).862 pounds
B).812 pounds D).932 pounds

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