16,25,36......that`s all :))
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36
sqrt(30)= 5.5 approx sqrt(40) = 6.3 approx The integer 6 is between the square roots. So the square of 6, which is a perfect square, will be between the two original numbers. So answer is 62 = 36.
No, 40 is not a perfect square
No.
The smallest perfect squares that end with 9 are 9 (the square of 3) 49 (the square of 7). Their difference is 40.