exam Maths Puzzle Numerical Ability

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At 9:00 on Saturday morning, two bicyclists heading in opposite directions pass each other on a bicycle path. The bicyclist heading north is riding 6 km/h

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exam Other Question

Can you please help me understand the rules and format for this type of math?

(6x^2-4x+7)+(2x^2-3x-9)=

I tried this one,but i cant figured it out?

6x-(4x-5)=13
6x+(4x+5)=13 I need helping solve this equation:

(12 over sqrt 5x + 6) = (sqrt 2x +5)

Thanks!