rounding to the nearest ten here is the problem

Question

85

19

73

15

9

27

6

14

69

46

48

31

82

7

13

1

59

3

24

17

5

2

11

8

Answer 1

To the nearest 10:

85 = 90

19 = 20

73 = 70

15 = 20

9 = 10

27 = 30

6 = 10

14 = 10

69 = 70

46 = 50

48 = 50

31 = 30

82 = 80

7 = 10

13 = 10

1 = 0

59 = 60

3 = 0

24 = 20

17 = 20

5 = 10

2 = 0

11 = 10

8 = 10

Answer 2

Round 2,342,388,548 to the nearest billion

Answer 3

9,019 rounded to the nearest ten

Answer 4

express the following numbers correct to the number of significant figures indicate in the brcket 

3.084 (2)
0.003 46 (1)
3.141 59 (2)
0.056 78 (3)
3.598 (3)
0.003 56 (2)
0.0351 (2)
8.353 (2)
4.826 (3)
0.04972 (2)
0.010 10 (3)
1.48356 (4)
16.047 (1)
0.574 38 (2) 
217.006 (5)
15.703 7 (4)
5.98 (2)
17.97 (3)
120.408 (5)
0.080 46 (2) 
0.103 49 (3)