< is angle
For the first one, <2+<3 equals 180
So, 37+<3=180. Rewrite that, and <3=180-37, which then <3 is 143 degrees
For the second one, COMPLEMENTARY ANGLES ADD UP TO 90 DEGREES
So, if one angle is 35 degrees, and we rewrite that again, 90-35 is it's complement.
So the answer to the second one is 90-35, 55.
I hope this is helpful