Choose a counterexample that proves that the conjecture below is false.. abc is a right triangle, so angle a measures 90 degrees. 1. angle c is 30 degrees. 2.angle b is 90 degrees. 3. angle c is 20 degrees. 4. angle b is an obtuse angle

me! what did you put for this question?

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