Yes you have the correct answers for each of the four problems. Nice work.
For anyone curious,
rd = removable discontinuity
id = infinite discontinuity
c = continuous
b, but I'm not sure. this could very easily be incorrect. you may need to look this up on google first.
x = 72
Step-by-step explanation:
x + (2x - 36) = 180
3x - 36 = 180
3x = 180 + 36
3x = 216
x = 216/3
x = 72
<span>you have to create variables that have the same coefficient</span>
That is a 30 60 90 triangle.
Read about those here: http://www.1728.org/trig2.htm
