Scientific Notation Commonly Results When We Work with Units of Measure

Multiple Choice

Scientific notation commonly results when we work with units of measure. Solve the following problem with a unit analysis and assume 365 days per year. Round the decimal part of your answer to two decimal places. How fast in feet per second is a silver birch tree growing if it is 20 feet tall after 10 years of growth?

A) $6.64 \times 10 ^ { - 6 }$ feet per second
B) $5.9 \times 10 ^ { - 9 }$ feet per second
C) $6.34 \times 10 ^ { - 7 }$ feet per second
D) $5.9 \times 10 ^ { - 8 }$ feet per second
E) $6.34 \times 10 ^ { - 8 }$ feet per second