exam Maths Puzzle Numerical Ability

determine if the following problem is rational or irrational. sqrt(625) please help

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exam Other Question

you can buy cookies 3 possible ways = 1 per package, 2 per package, or 6 per package..... how many different ways can you buy 12 cookies solve{{{343x^3=1}}} (there are 3 solutions one real and 2 complex)