wb b2 5a p 52 53 ex 1

wb b2 p 52-53 ex 1 question 1

wb b2 p 52-53 ex 1 question 2

wb b2 p 52-53 ex 1 question 3

wb b2 p 52-53 ex 1 question 4

wb b2 p 52-53 ex 1 question 5

wb b2 p 52-53 ex 1 question 6