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This basically asks you to find the vertex of the equation

find the derivative and set it to zero

solve for x then

What formula would I use?

I don't know any formulas but I do know how to find it using a derivative

Ok, any advice on how I should proceed?

Find the derivative

So if I get a derivative of 4.3-0.004x, what should I do then?

set it to zero and solve for x

4.3-0.004x=0

4.3-0.004x=0
-0.004x=-4.3
x=-4.3/-0.004
x=1075

1075 items

i see, so the derivative is the key, awesome, thanks!

Ah, ok I got you.