exam Maths Puzzle Numerical Ability

name a ray on line ad that intersects ray cb in exactly one point
<----a---------b-----------c---------d--->

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exam Other Question

Please help me simplify by combining like terms:

x*sqrt18-3*sqrt8x^2

I got as far as: x*sqrt9*2-3*sqrt2^3x^2=x*sqrt3^2*2-3*sqrt2^3x^2

Thank you so much for your help. kindly show me the answer and solution to this problem.....divide 56 into two parts. If the larger number exceeds twice the smaller number by 5, find the numbers....i hope that you can show me the step-by-step solution and the answer