in a box, there are black pens, red pens and green pens the ratio of black pens to not black pens is 9:11 the ratio of green pens to not green pens is 3:5 fins the ratio of black pens to red pens to green pens WITH A STEP BY STEP EXPLANATION PLEASE

where r the answers

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

answer4 to the second power is 16

and 4 to the third power is 64,

the answer is 21%.