book Maths Puzzle Numerical Ability

What do lenths have to do with this?

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book Other Question

Okay this is a function of a right triangle where side a is equal to 16 and its corresponding angle is 45 degrees side b and the hypoteneous are unknown. Is there a way to solve for the two missing sides? 2(X+1)=4-3(2x+1) - what does x equal?