Angles in a line = 180
180-165 = 15 degrees
15 + 45 + ? = 180
60 + ? = 180
? = 120
Download photo math for equations like this, it will also give you it step by step :)
Check the picture below.
Make sure your calculator is in Degree mode.
Step-by-step explanation:
slope is the rise over run
rise= X
run= Y
X/Y = slope