Final answer:
It would take approximately 23,900,000 years for the pulse of radio waves to reach Earth from the star.
Step-by-step explanation:
To calculate the time it takes for a pulse of radio waves to reach Earth from a star, you can use the formula:
time = distance / speed of light
Given that the star is 7.17 x 10^18 m away from Earth, and the speed of light is approximately 3 x 10^8 m/s, we can calculate the time:
time = (7.17 x 10^18 m) / (3 x 10^8 m/s)
which simplifies to:
time ≈ 23,900,000 years
Therefore, it would take approximately 23,900,000 years for the pulse of radio waves to reach Earth from the star.