exam Maths Puzzle Numerical Ability

I have NO clue where to start.
Give a counterexample to show the statement is not always true for real numbers a, b, & c. If a

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exam Other Question

Express both in terms of x

1. ln(x) = 2

what I thought was x = e^2 but that seemed too simple

2. tan^-1 x = 1 Find the inverse of:
[a b
_c d]

So far I have done this:

__[ a b 1 0
____c d 0 1]

~_[ 1 b/a 1/a 0
____c__d___0__1 ]

~_[ 1____b/a_____1/a____0
____0__d-(cb/a)__-c/a