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

A portable paint compressor is priced at $196.50. If the sales tax rate is 5.5%, what is the tax? Evaluate the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing values of x.

4. f(x) = 10^x