Scientific notation for these numbers?

[From: ] [author: ] [Date: 14-05-12] [Hit: ]

100,9,000,000,000,000 - a.......

23,000,000,000,000,000

15,100,000

9,000,000,000,000

a.) 2.3 x 10^16

b.) 1.51 x 10^7

c.) 9 x 10^12

2.3 * 10^16
1.51 * 10^7
9 * 10^12

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