- I figured out 8.1.1 but how do i explain 8.1.2?

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Need help with determining the structural formula!!? Need helping completing these reactions! I just don't get what to do ):? What is the perimeter of an equilateral triangle whose side measures 9 and 1/3 mi.
The perimeter is - mi.??? Clinical term statement for getting alone with family? F(x)={1-coskx /xsinx; x is not =0 and 1/2; x=0}. Find k?