Answer:
5x-7
Step-by-step explanation:
5 times x (a number) subtract 7
y = 45°
4 sides = 360°
(2y+1)° + y° + 112° + 112° = 360°
2y + y = 360 - 112 - 112 - 1
3y = 135
y = 135÷3
= 45°
