4 and 5)16.97 or 12√2
6)15.59 or 9√3
7)y = 15.59 or 9√3 x =27
8)17.80
answer: when you burn wood, the carbon reacts with the oxygen in the air to create ash and smoke. that is a permanent change you cannot undo that.
step-by-step explanation:
can you rephrase the question ? it is unclear : -)