Try it out! Take the square of several (in this case small) integers, until you find one square that is less than 15, and one that is more.
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75 lies between two consecutive even integers, 74 and 76. The square root of 75 lies between 8 and 9.
It lies between 9 and 10. The square-root of 82 is nine point 'something'
THere are two pair of consecutive integers. 52 = 25 < 30 < 36 = 62 So, one pair is 5 and 6 and the other pair is -6 and -5.
The square root of 85 lies between 9 and 10
The square root of 47 lies between the consecutive whole numbers 6 and 7.