Question

identify root 4 as rational or irrational

Answer 1

Root 4 Is rational no. As from the definition of rational number we have that numbers which can be represented in form of 
p/q Where q is not equal to 0 And p,q are Co-Prime. Two number are Co-Prime if the only common positive integer which divides them is 1. Here root 4 can be expressed in p/q satisfying the conditions told above. i.e. (root 4)/1 Or 2/1 As root 4 Is 2. And 2 , 1 Are co prime.
hence Root 4 Is rational.

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Answer 2

Root is a rational number because,
Root 4=root 2×2
So root 4=2