During a recent election, 42 of every 100 registered voters in a certain city voted. if there were 142,400 registered voters in that city, how many people voted?
[ __ ] people voted in the recent election. ?

answer: i think it is (1,-2)

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