Answer:
x nth term =6–3(n-1)
Step-by-step explanation:
Since they start at 6 its X nth term n=6- but since the since one is 6 its 3(n-1) so x nth term=6-3(n-1)
28×3÷2=14×2×3÷2=14×3=42
it must be number 1
I am sure about parallel side and 4 right angles