4x +28 and 68 are vertical angles and are equal.
Set them to equal each other to solve for x:
4x +28 = 68
Subtract 28 from each side:
4x = 40
Divide both sides by 4:
x = 40/4
x = 10
Answers are in an attached photo
Answer:
Step-by-step explanation:
Cos 300 = Cos ( 360 - 60)
= Cos 60