Greetings!
"Heather measured a swimming pool and made a scale drawing. In real life, the pool is 45 meters long. It is 65 millimeters long in the drawing. What scale did Heather use for the drawing?"...
65mm=45m
Reduce to Simpliest Form.
65/5=45/5
13mm=9m
As a Representative Fraction (scale), it would look like: (in regards to mm)
13:9000
Hope this helps.
-Benjamin