Yes. Any number that can be expressed as a finite or repeating decimal is a rational number. Irrational Numbers have decimal expansions that neither repeat nor terminate.
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1 in = 0.0254m 171 in = 171 x 0.0254 m ~= 4.34m
45/171 - 9/171 = 36/171
109/171 = 109 ÷ 171 = 0.6374
40% off 171 dollars = 60% [left] of 171 dollars = 171*60/100 = 102.6 dollars
171 is a composite because it has more factors than 1 and itself. The factors of 171 are 1, 3, 9, 19, 57, and 171.