Question

using the ruler, what is the value of a considering significant figures? ___ cm
enter the answer

Explanation:

Step1: Identify ruler's precision

The ruler has markings every 1 - mm (0.1 cm).

Step2: Read the measurement

The arrow points between 12.2 cm and 12.3 cm. We estimate the last digit. Since it is closer to 12.3 cm, we read it as 12.3 cm considering significant - figures.

Answer:

12.3