Question

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Which of the following is irrational?
A.square root of 10
B.square root of 25
C.square root of 100
D.square root of 225

Answer 1

Take the square root of each number using a calculator.
If the number ends, it's rational.
If the number does not end and does not repeat, it's irrational.

Answer 2

is it A?

Answer 3

correct

Answer 4

yes, its A

we can do this also by listing the perfect squares:

0,1,4,9,16
notice there is not 10 there