book Maths Puzzle Numerical Ability

Evaluate x to 5 significant digits

x = ln (4.3931 x 10^-11)

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book Other Question

Use Cramers Rule to solve.

2x+2y+z=1
-x+y+2z=3
x+2y+4z=0 given : V vect.space , T operator , rank(T2)=rank(T).
prove range of T and N(T) DISJOINT ( ZERO COMMON VECTOR ONLY)?

ALSO PLEASE: GIVEN :V,T ,T2 = 0 ,What will be R(T)& N(T) re