book Maths Puzzle Numerical Ability

I need To Simplify the following square roots in simplest radical form and I have no clue how to do this

3/5 and m/n

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book Other Question
(1) find the exact value of sec(225degrees)



(2) In the triangle ABC, find A, if B= 100 degrees, and a=20.


(3) In the triangle ABC, find b, iF A=15, C=12 and angle b=150 degrees. I dont even know where to begin on this one. In each pair of equations, give the slope of each line,