Please help and show the work, no links :)

So a triangle will always equal 180°, and since you already have angels Q and R, it’ll be easy to find angel P
Add Q and R together 28° + 67° = 95°
Use 180° and subtract it to 95°
180° - 95° = 85°

Your explanation can easily be “I added both Q and R together and subtracted it by 180 in order to find the angel P”