Final answer:
There are 15 lines of 1/16th of an inch between the 4" and 5" marks on a ruler, excluding the initial mark at 4" which is the starting point.
Step-by-step explanation:
The question asks how many 1/16th inch lines are there between the 4" and 5" marks on a ruler. To find the answer, we can consider that one inch is equal to 16 sixteenths, so between any two inch marks (such as between 4" and 5"), there would be 16 segments of 1/16th of an inch.
However, the first line at the 4" mark is not counted because it represents the 4" mark itself. Therefore, we start counting from the next line after the 4" mark, which means there are 15 lines of 1/16th of an inch between the 4" and 5" marks on the ruler.