To use inches to measure a math book would make more sense, but feet does too, since a math book's length on the binding side is close to a foot.
Inches makes the most sense though.
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A weighing scale would not be able to measure in feet and inches.A weighing scale would not be able to measure in feet and inches.A weighing scale would not be able to measure in feet and inches.A weighing scale would not be able to measure in feet and inches.
69.50/12 = 5.79166 feet
People aren't always exactly X feet high. For example, I am a few inches above 5 feet. It would be too obnoxious to say 5 feet 30 centimeters.
875/12 = 72 feet 11 inches
A ruler is used to measure distances. Feet, inches, meters, centimeters, and millimeters.