The average annual income, I, in dollars, of a lawyer with an age of x years is modeled with the following function:

Question

smileyxl3 · Answer

$$I=-425x^2+45500x-650000$$
According to this model, what is the maximum average annual income, in dollars, a lawyer can earn?

Round to the nearest whole dollar.

smileyxl3 · Answer

Isn't there supposed to be an age for me to solve the question?

anonymous · Answer

how to find the max of any function?

smileyxl3 · Answer

Find the vertex

anonymous · Answer

just derive it and set the derivative to equal zero

anonymous · Answer

then you could find x for max of I

smileyxl3 · Answer

ok let me try to get an equation

smileyxl3 · Answer

Um, it's supposed to be this (c - b^2/4a) right?

anonymous · Answer

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