I uploaded it here as the answers Bc
Slkwowkneojw
What do u need help with ?, trigonometry?
34! Find the area of each of the six sides and then add them up:)
You should get it now from my previous answer.
But to apply it.
9 - 8b + 6b
9 + (-8b + 6b) <- Collect like bases (b)
9 + (-2b)
9 - 2b
Therefore it simplified is 9 - 2b