Astronomer Edwin Hubble postulated a relationship between the distance between Earth and the velocity at which a galaxy appears to be traveling away from Earth. The following table shows observations of seven galaxies. Distance is measured in megaparsecs (1 Mpc is approximately 3,260 light-years), and velocity is measured in kilometers per second. Distance (Mpc) Velocity (km/s) 51.8 4,500 12.2 1,234 271 17,620 46.2 3,777 58.2 5,143 46.2 3,777 29.1 1,769 (a) Find the equation of linear regression line for the data where distance is the independent variable, x, and velocity Is the dependent variable. (Round your numerical answers to two decimal places.) (b) Using the equation from part (a), estimate the velocity (in kilometers per second) at which a galaxy 100 Mpc from Earth is traveling. (Round your answer to the nearest whole number.) km/s