Question

Answer all 4 please

Answer 1

1)
$180 - (37 + 90) = 180 - 127 \\ = 53$
2)
$(180 - 15) \div 2 = 165 \div 2 \\ = 82.5$
each of other angles measures 82.5 degrees

3)
$180 - (42 + 20) = 180 - 62 \\ = 118$
4)sorry I don't know the last one