Final answer:
The distance between Greenville and North Valley on Crystal's map can be found by multiplying the map distance measurement (e.g., 3 inches) by the scale factor (18 miles per inch), resulting in an answer of 54 miles.
Step-by-step explanation:
To determine how far apart Greenville and North Valley are on Crystal's map, you need to measure the distance between the two points on the map with a ruler. Let's say you measure the distance to be 3 inches on the map. According to the scale on Crystal's map, 1 inch equals 18 miles. Therefore, to find the actual distance between Greenville and North Valley, you would multiply the distance measurement on the map by the scale factor.
The calculation would be 3 inches x 18 miles/inch = 54 miles. So, Greenville is 54 miles apart from North Valley according to the scale provided on Crystal's map. This type of problem involves using a map scale to convert distances on a map to real-world distances, which is a practical application of proportion and ratio concepts commonly found in mathematics.