9 In a bag there are red, green and purple counters.
38 of the counters are red.
16 of the counters are green.
What fraction of the counters are purple?

not sure because we are not given the sample of all the bags so I can not tell for that

the answer is here: : )

:

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