Question

Jim and Mark start at the same place jim walks 15ft West and Mark Walks 12 feet North how far apart are the boys when they finish walking

Answer 1

the two points where they end and the point where they start form a right triangle, one leg is 12, the other leg is 15, you need to find the hypotenuse.
use the Pythagorean theorem: 12²+15²=c²
c≈19
they are about 19 feet apart.