Equations word problem

Question

For each planet in a solar? system, its year is the time it takes the planet to revolve around the center star. The formula E = 0.2 x 3/2 models the number of Earth days in a? planet's year,? E, where x is the average distance of the planet from the center? star, in millions of kilometers. There are approximately 686.2 Earth days in the year of Planet Upper D Planet D. What is the average distance of Planet Upper D Planet D from the center? star? The average distance is approximately ______ million kilometers.

Answer 1

E = 0.2x + 1.5

 

686.2 = 0.2x + 1.5             subtract 1.5 from both sides

684.7 = 0.2x                       divide both sides by 0.2

3423.5 = x

 

Is this in millions of km?