2. For each planet in the solar system, its year is the time it takes the planet to revolve around the sun. There are

approximately 687 Earth days in a year on the planet Mars.

a. The formula E (x) models the number of Earth days in a planet's year, E, where x is the average distance of

the planet from the sun, in millions of kilometers. Calculate average distance of Mars from the sun.

8(x) = 0.2x²

b. Write the answer in a complete sentence and include proper units.