Estimate of the number of stars in our galaxy

Consider the following problem: a box with an open top is to be constructed from a square piece of cardboard, 3 ft wide, by cutting out a square from each of the four corners and bending up the sides. find the largest volume that such a box can have.

Why is metal often used for cooking pan?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?