exam Maths Puzzle Numerical Ability

rewrite using the radical symbol and simplify if possible 18^3/4

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exam Other Question

Can you help me with these log problems? solve with calculator to the fourth place
Thanks
14.)log 0.0332
15.)ln 40,257
16.) log x-2.0832
17.) ln x = -1.1577
Find the value of k so that the equation below has the solution set {-5}.

4(x+3)=x(3-k)

so far i have this but my main problem is what is the definition of a solution set?

4x+12=3x-kx minus 3x from each side. x+12/x= -kx/x then -12/x=k