exam Maths Puzzle Numerical Ability

SOLVE THE EQUATION ln(x + 5) - ln(3)=ln(x-3).

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exam Other Question

i have to find the equivalent to this expression.
4(12m/3)+9-2(3m)
choices are as follows:
A: 16m+9
B: 31m
C: 10m+9
D: 19m
This problem has confused me. Thanks!!! In order to find the height of an obtuse triangle does the base need to be one of the obtuse angle sides? Why? Thank you.