exam Maths Puzzle Numerical Ability

given triangle ABC with a=10 A=13 and B=26 what is the lenght of c?
i hope you can help
thanks a bunch!

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exam Other Question

Solve the systemby addition or substitution.
3x -4y =8
6x -2y =10

This is the answer I got:
9x-6y =18 solve by any method you prefer.

u^2 - 15u = -1