PLEASE HELP, DUE TONIGHT!!! (precalc problem) Use the graph of the function f(x) to answer each question. Use ∞ , -∞ or DNE where appropriate. Explain if DNE. (I will be giving an additional 60 points and brainliest if properly answered, thank you so much)

answer: 19 is   2

step-by-step explanation: i just looked at your answer and wrote it down

answer is x<

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