Please help with the problem attached.

Step-by-step explanation:

You have to use the Law of Cosines here to find angle R.  Namely,

Filling in:

and

and

and

so

Use the 2nd button and then the cos button to find the angle that has a cos of that decimal.  You should get, as long as you are in degree mode, that angle R = 31.4°

x = 12

y = 15

step-by-step explanation:

answer: add the !

step-by-step explanation: then we will answer