exam Maths Puzzle Numerical Ability

If ln 4=1.3863, ln 3=1.0986, and lf 5=1.6094, find ln 3/20?

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Please help me.

Solve by completing the square.
2x^2+10x+11=0

I get-5+-sqrt23/2

not sure how I got there. Is it right? How should I work it out.
How do I write 4.108×104</sup> in standard form? We are on scientific notations , and I am lost