exam Maths Puzzle Numerical Ability

Please help with this problem, simplify: (3x^3y^-4)^3

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exam Other Question

Determine whether it is rational or irrational:

SQRT 49/100

This would be irrational because there is no other number that can simplify this matter correct? Thanks a lot for you help. how would i graph this funtion?

f(x)= x+6, if x< or equal to -3

-2/3x-3, if x > - 3