one foot and nine inches = 21 inches
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0.75 foot 1 foot = 12 inches 9 inches: = 9 inches * 1 foot/12 inches = 9/12 or 3/4 = 0.75 foot
No, it means 1 foot plus 9/10 of a foot. 1 foot 9 inches would be written (for example) as 1'9"
No, a foot is 12 inches.
0.75 foot1 foot = 12 inches9 inches * 1 foot/12 inches = 0.75 foot
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