36 9+9+9+9=36
36
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The square root of four twenty-fifths, is two fifths, because of the fact that the square root of four is two and the square root of twenty-five is five.
four fifths
divide 45 by 5 and multiply by 3 45 divided by 5 is 7 times 3 is 21.
5/8 minus 4/5 is -7/40
Learn your math...JK 6 and four fifths is written like so: 6.4 so two fifths.