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question 3:
given (-2/3)+(-3/11+5/22)=(-2/3-3/11)+5/22
consider LHS (-2/3)+(-3/11+5/22)
=-(2/3)+(-1/22)
=-47/66
consider RHS (-2/3-3/11)+5/22
=(-2/3-3/11)+5/22
=(-31/33)+5/22
=-47/66
as LHS=RHS they are equal
QUESTION 2:
given that p=5/6,q=-7/6,r=13/16
given (p + q)+r=p+(q + r)
consider LHS of the equation
=(p + q)+r
=(5/6-7/6)+13/16
=-2/6+13/6
=-1/3+13/6
=(-6+39)/18
=-33/18=-11/6
now consider RHS
=p+(q + r)
=-5/6+(-7/6+13/16)
=-5/6+(-112+78)/96
=-5/6-34/96
=-5/6-17/48=(-2640-102)/4608=457/768
LHS not equal to RHS so they are not equal
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