Yes. The square root of any number that is not a perfect square (like 9 or 36) is irrational.
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No - the square root of 40 is not a rational number. Rounded to ten decimal places, it is equal to 6.3245553203.
Ten feet times ten feet equals one hundred square feet.
This is not a correct comparison. Cubic feet is a measure of volume while square feet is a measure of area.
ten more than five times a number
It is then 410,000 when rounded to the nearest ten thousand