.8
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8 and 9. 8 squared is 64. 9 squared is 81. 64 < 75 < 81, hence the square root of 75 is somewhere between 8 and 9.
Yes, 0.875 is greater than 0.75. To decide which is bigger you look at the first digit after the decimal point, and the larger one is the greater number. Since 8 is larger than 7, that means .875 is greater than .75.
155
75 is greater than 66.