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ALWAYS use significant figure rules. Remember that these rules apply to all numbers that are measurements.
Light travels approximately 982,080,000 ft/s, and one year has approximately 32,000,000 seconds. A light year is the distance light travels in one year.

Calculate the distance of one light year in inches.

2.6 x 1015 in
9.310 in
1.0 x 1016 in
3.8 x 1017 in