exam Maths Puzzle Numerical Ability

Is this rational or irrational:

sqrt -

I believe this is irrational because there is no numbers involved in this, am I correct? Thank you very much!

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exam Other Question

Walt made an extra 9000 last year from a part time job. He invested part of the money at 9% and the rest at 8%. He made a total of $770.00 in interest. How much was invested at 8%? Two sides of a triangle are 12 and 15 cm long. Which measurement can be the length of the third side?