







An open top box 
20181212 

Kirklan pose la question : Jeremy wants to construct an open box from an18inch square piece of aluminum. He plans to cut equal squares, with sides of x inches, from each corner and then fold each side up to form the box. If Jeremy wants the volume of the box to be 432 cubic inches, what should the minimum length of the sides of the squares cut from each corner be? Find the volume, V, of the box as a function of x. Given: V = length × width × height. Penny Nom lui répond. 





An open ball is an open set? 
20160623 

Aqeel pose la question : Theorem: The open ball is an open set? Harley Weston lui répond. 





Is a line lying in a plane an open or a closed region? 
20130213 

pardeep pose la question : please help with this question on the open and closed intervals ::
Is a line lying in a plane an open or a closed region? my teacher says it is a closed region reasoning out that it contains all it boundary points. please help how is it so? Harley Weston lui répond. 





Differentiable on an interval 
20100812 

Dave pose la question : Hi
I was wondering if a function can be differentiable at its endpoint. For example if I have Y = X^2 and it is bounded on closed interval [1,4], then is the derivative of the function differentiable on the closed interval [1,4] or open interval (1,4). They always say in many theorems that function is continuous on closed interval [a,b] and differentiable on open interval (a,b) and an example of this is Rolle's theorem. Thank you for your help. Robert Dawson lui répond. 





The extended real numbers 
20091102 

Justin pose la question : Hello there, I was wondering is the set of extended real numbers a closed set or an open set?
Justin Robert Dawson lui répond. 





An open box 
20080423 

Le pose la question : Metal Fabrication; If an open box is made from a tin sheet 8 in square by cutting out identical squares from each corner and bending up the resulting flaps, determine the dimensions of the largest box that can be made. Harley Weston lui répond. 





Marginal Propensity to Consume 
20010509 

Esther pose la question : The derivative of the national consumption function C = f(y) is called the ____________________. Judi McDonald lui répond. 

