exam Maths Puzzle Numerical Ability

x/3-2x>3x

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exam Other Question

Could I please get some help with the following problem:

there is a diagram of a triangle
one side is = 1, another side is = 4 and there is 100 degree angle
I am looking for the value of side C

thank you,
RF Find a value for k so that 9m^2-kn^2 will have the factors 3m+7n and 3m-7n.

I;m confused with the question. ANy help would be appreciated.