Question

use the ruler to find the diameter (the distance across the center) of the coin. you need to place the ruler across the center of the coin. the zero on the scale must be at the left edge of the coin. measure

Explanation:

Step1: Identify the start - point

The zero of the ruler is at the left - edge of the coin as per the instruction.

Step2: Read the end - point

The right - most point of the coin on the ruler is at 7.5 (assuming the units are in centimeters as no unit is specified).

Answer:

7.5 (units not specified in the given image, could be cm etc.)