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inches
89.
First, convert 2843in to feet. This is done by taking 2843/12=236.917 ft. Then, to go from feet to miles, the conversion is 5280ft/mile, so take 236.917/5280 to obtain .044871 miles. MILES would be the numerator
If the two bottom numbers are the same, you will carry that same number over to the denominator in the answer. To get the numerator (top number) simply subtract the two numerator and place the number over the answer denominator.
seconds
Inches
inches
inches go in the numerator
inches
89.
inches
2843in x 1ft/12in x 1mi/5280ft = 0.04487mi
20
FEET
You would place "centimeters" in numerator and "centimeters per inch" in the denominator. (centimeters)/(centimeters/inch) = [(centimeters) x (inch)] / [centimeters] which yields "inch(es)"
First, convert 2843in to feet. This is done by taking 2843/12=236.917 ft. Then, to go from feet to miles, the conversion is 5280ft/mile, so take 236.917/5280 to obtain .044871 miles. MILES would be the numerator
1/2.54 = x/54 x = 21.26