Answer:
z=-4.5 , MC=21
Explanation:
AC=AM+MC
42=3-4x+3-4x ( since M is the mid point then AM=MC=3-4x)
42=6-8x
42-6=-8x
-8x=36
x=-36/8
x=-4.5
AM=MC=3-4x
MC=3-4(-4.5)= 3+18=21
MC=21
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