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5. How many significant figures are in the following numbers?
(a) `78.9 \+- 0.2`
(b) `3.788 \times 10^9`
(c) `2.46 \times 10^(-6)`
(d) `0.0053`
(a) 3
(b) 4
(c) 3
(d) 2
(a)
`78.9 ± 0.2`
3 significant figures (count digit)
(b)
`3.799 times 10^9`
4 significant figures (count digit)
(c)
`2.46 times 10^(-6)`
3 significant figures (count digit)
(d)
`0.0053 = 5.3 times 10^(-3)`
2 significant figures
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