Express the following to four significant figures:
`(i)6.45372" "(ii)48.38250" "(iii)70000" "(iv) 2.65986xx10^(3)" "(v) 0.004687`

Explanation

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

### Step 1: Identify 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: Round to Four Significant Figures
We will round the numbers to retain only four significant figures. If the fifth figure is 5 or more, we will round up the fourth figure.

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