Question

Distances in space are measured in light-years. The distance from Earth to a star is 6.8 × 1013 kilometers. What is the distance, in light-years, from Earth to the star (1 light-year = 9.46 × 1012 kilometers)? 2.66 light-years 7.18 light-years 7.74 light-years 9.46 light-years

Answer 1

$\dfrac{6.8\cdot 10^{13}}{9.46\cdot 10^{12}}=\dfrac{6.8}{9.46}\cdot 10\approx 7.188$
Answer: 7.18 light-years.