Determine the number of significant figures (digits) in each of the following:

#1:   12.53

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5

 #2:    8702

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2
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4
5

#3:    0.0084

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5

#4:    89,000

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2
3
4
5

#5:    89.000

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2
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5

#6:   1.230

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5

#7:    9,000

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2
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4
5

#8:    7020

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5

#9:    0.0001

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5

#10:   5.2 x 102

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5

#11:    70,001

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5

#12:    0.0250

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5

#13:    1.00 x 10-4

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5

#14:    250,000,000

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5

#15:     90,020

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5