exam Maths Puzzle Numerical Ability

solve triangle ABC given that a=13 b=14 and c=11. round to the nearest tenth.
please help me figure this out.
i dont know how.
thanks a lot!

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exam Other Question

What is the Domain of the function y = (x 2 – 2) /( x – 2).

Also, find f(x + 1).
add 5+1/2=