What is the solution set of (x1 x<-5) n {xl x>5)?
all numbers less than -5 and greater than 5
the numbers between -5 and 5
the empty set
all real numbers

you can't solve x because it is 2 linear equation and you only have one equation

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