The classes at the middle school want to raise money. the sixth grade runs a bake sale for 5 5 hours and makes $170 $ 170 . the seventh grade sets up a dunking booth for 4 4 hours and makes $112 $ 112 . the eighth grade has a car wash and makes $192 $ 192 in 6 6 hours. which class has the highest rate for raising money? clear check

answer:

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