Express the following numbers to four significant figures
(i) 5.607982
(ii) 32.392800
(iii) `1.78986xx10^(3)`
(iv) 0.007837.

Explanation

To express the given numbers to four significant figures, we will follow these steps:

### Step 1: Understand Significant Figures
Significant figures include all non-zero digits, any zeros between significant digits, and any trailing zeros in the decimal portion. Leading zeros are not significant.

### Step 2: Process Each Number

**(i) 5.607982**
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