P≈9.12
area 4
.......................................................................
Step-by-step explanation:
Given the expression:

Follow BODMAS rule.
always evaluate brackets first, followed by multiply or division then addition or subtraction from LEFT to RIGHT.

Put the coordinates of the point in for x, y, and z and see what the new constant is.
Your plane is
5x +4y +2z = -31
Answer:
∠AOB=40°
∠BOC=68°
Step-by-step explanation:
Hope this helps Have a nice day