Step-by-step explanation:
#1
6 × n + 15 = -42
6n + 15 = -42
6n = -42 - 15
6n = -57
n = -57/6
n = -19/3
#2
b + 3/2b + b + 45 + 2b - 5 + 90 = 540
b + 1.5b + b + 45 + 2b - 5 + 90 = 540
5.5b + 130 = 540
5.5b = 540 - 130
5.5b = 410
b = 410/5.5
b = 74.5
Angles are
b = 74.5
1.5(74.5) = 111.75
74.5 + 45 = 119.5
2(74.5) - 5 = 144
