A=1/2(b*1+b*2)h A- b*1 = 2a/h - b*2
B- b*1 = 2a/ h +b*2
C- b*1 = 2a + b*2/h
D- b*1 = 2a - b*2/h

Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb