1.  When companies sell products, the use materials, to create the product, and to encase it  The less material they lose, the more money they save, so minimizing surface area is extremely important in economics This Simpsons Soundtrack is in a Donut Case – this has more surface area than a regular square shaped CD-case

2.  This is a company that manufactures baskets  Approximating its shape to be a rectangle: 100 m 50 m 70 m Surface Area = Area of All Sides = 2 x (area of front) + 2 x (area of side) + 2 x (area of top) = 2(l x h) + 2(w x h) + 2(l x w) = 2(100 x 70) + 2(50 x 70) + 2(100 x 50) = 2(7000) + 2(3500) + 2(5000) = 14000 + 7000 + 10000 = 31000 m 2

3.  Leaning Tower of Pisa  Approximating its shape to be a (straight) cylinder:  Radius = 4 m  Height = 20 m

8.  p. 32 #5, 8, 9, 11, 13