Help I need answers now which one is decelerating in negative direction

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.

What is work? how much work is done to move an object 0 meters?

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant