Anew car has a list price of $26,500. suppose that the dealer markup on this car is 20%. what is the dealer's cost?
(when answering this question, can you show me the formula you used so i know how to set up the equation to solve it? .)

Iam unsure about what the proof is, therefore as much as wish to i can not.

Idon't see any graph, however the graph of the function : f(x) = x²-2x+3 is a parabola: 1) open upward (since a> 0)2) it intersects y-axis in 3 (y=3)3) its axis of symmetry is x = +1 ( -b/2a)4) it's minimum is y = -2, so its vertex is (1,-2)5) it doesn't intersect the x-axis since discriminant < 0