7

-1

-6

3

(a)  

7

-1

2

-1

(a)  

7

1

-1

-5

(a)  

3

-3

8

-8

(a)  

86

-66

(a)  

46

53

(a)  

26

53

(a)  

95

-30

(a)  

84

-63

(a)  

92

-20

10

7

(a)  

82

7

-12

-57

(a)  

77

-65

67

-9

(a)  

16

62

-57

68

(a)  

79

-78

67

-67

(a)