1. How many students have at least 1 brother but no sisters? 2. How many students have at least 1 sister but no brothers?

3. How many students have no brothers and no sisters?

4. How many students have brothers or sisters?

tube or goog would be a great resource to with that question

0.02040816326

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

answer

step-by-step explanation: