please answer questions 6 and 7

6. A function y= fox has first derivative dy (JX= 4 ( X+2) ( x - 2) at x = - 2 and X = 2, we have ( x-4) 45 a vertical tangents bo a horizontal tangent ( x = - 2 ) and a vertical fangent (x= 2) c. horizontal tangents to a vertical tangent (x= - 2) an a horizontal fangent ( x= 2) e. horizontal asymptotes 7. A closed box is to be constructed so the base length is three times the base width and is to have a volume of 540 cm. find the dimensions of the box so it has the smallest possible surface area. WI = 2 1 = 2 H