exam Maths Puzzle Numerical Ability

Determine whether it is rational or irrational:

3 sqrt 121

I believe this is rational, is this correct? Thank you

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exam Other Question

Find the LCM for the pair of polynomial: 7m-21 and 14m-42. Given that sine theta equals 4/5 and theta is acute, find the value of the remaining 5 trigonometry functions.