Question

how many sig. fig. are in the number below: 0.007809

Explanation:

Step1: Recall sig - fig rules

Non - zero digits are significant. Zeros between non - zero digits are significant. Leading zeros (zeros before the first non - zero digit) are not significant.

Step2: Analyze the number 0.007809

The non - zero digits 7, 8, 9 are significant. The zero between 8 and 9 is also significant. The leading zeros (the three zeros before 7) are not significant.

Answer:

4