question 1: A rectangular box has a square base and its height is 1 cm longer than the length of one side of its base.
the total surface area is given by
A= 6X^2+ 4X
If the total surface area is 240 cm^2, find the dimensions of the box.
Question 2: An open box contains 80 cm^3 and is made from a square piece of tinplate with 3 cm squares cut from each of its 4 corners. Find the dimensions of the original piece of tinplate.
Question 3: Is it possible to bend a 20 cm length of wire into the shape of a rectangle which has an area of 30 cm^2?