What ethnic group made up the ruling class of the yuan dynasty?           a. han   b. manchu   c. japanese   d. mongol

Mongol were the ones who made the Yuan Dynasty. :D

The answer you are looking for is Mongol

Remember soh-cah-toasoh: cah: toa: now, looking at the picture we can see that we have an angle, the hypotenuse and want to find the value of the adjacent side to the angle. so we use cah to find the adjacent angle. plug in what we have: we need to solve for x now so we get it by itself on one side: plug this into your calculator and you'll find that: