exam Maths Puzzle Numerical Ability

Determine whether sqrt49/100 is rational or irrational.

Can anyone help me with the steps to figure this out? Thank you!

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exam Other Question

f(x)=7x+2 find f(x) when x=0 and when x=1 Solve for x: log(z,8) = -3

Simplify:(( log(5,(log(2,32) ))