Me! suppose ruth ann has 3 routes she can travel between the school to the library and 5 routes from the library to her home. how many routes are there from ruth anns school to her home with a stop at the library. a. 9 b. 60 c. 15 d. 25

To find the answer, multiply the number of routes because it gives the number of permutations (choices) you can take. 
There are 3 routes between school and the library.
 There are 5 routes from the library to her home. 
 Therefore, there are 3 x 5 = 15 total routes