2 (a) The length of a rectangle is 6 cm more than its width, w cm. The perimeter of the rectangle is 37 cm. Form an equation in w and solve it to find the width of the rectangle. (b) A rectangle 20 cm by 8 cm is cut from a rectangle 28 cm by 15 cm. Each measurement is given correct to the nearest centimetre. Calculate the upper bound for the area of the shaded region.