exam Maths Puzzle Numerical Ability

Determine if this is rational or irrational:

sqrt 77

This would be rational correct? I know 11 can go in to but it is as well and odd number, so i am not real sure. Thank you for the help!

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exam Other Question

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Rewrite the equation -8x - 5y = -45 as a function of x. Allen bought 20 stamps at the post office in 37 cents and 20 cents denominations. If the total cost of the stamps was $7.06, how many 37 cent stamps did Allen buy?