Answer:
-1
Step-by-step explanation:
1x= -1
x= -1
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Because force= acceleration x mass Acceleration is constant for a body of any mass since force is exactly proportional to mass.
A^2+b^2=c^2
20^2+b^2=29^2
400+b^2=841
-400. -400
b^2=√441
b=21