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Answer:
1)
AC=31
CD=45
THEN
AD=AC+CD
or,AD=32+45
or,AD=77
therefore AD=77
2)
BD=BC+CD
Or, 4x+4=97+x-6
or,4x-x=97-6-4
or,3x=87
or,x=87/3
therefore ...
x=29