C (x) = 0.4x^2-208x+37,365. what is the minimum cost of manufacturing dresses?

2nd degree and in form ax^2+bx+c it is a prabola the minimum cost is the vertex (every parabola has only one, min or max) minimum cost is the vertex vertex=-b / (2a) a=0.4 b=-208 vertex = - (-208) / (2*0.4) vertex=208/0.8 vertex=260 (means 260 dresses) that is x value subsitute for y value C (x) = 0.4 (260) ^2-208 (260) + 37365 C (x) = 10325 minimum cost is $10,325