Question

how many significant figures are in the number 2000009?
5
1
3
7

Explanation:

Step1: Recall significant - figure rules

Non - zero digits are always significant. Zeros between non - zero digits are significant.

Step2: Analyze the number 2000009

The number 2000009 has 7 digits. The 2 and 9 are non - zero digits, and the zeros between 2 and 9 are also significant.

Answer:

7