There is no real planet that is 1/10 the distance Uranus is from the sun, however the planetoid (smaller planet), Vesta is 1/9 the distance Uranus is from the sun.
Use this equation: A=3.14159r^2
Answer:
For this problem, simply substitute x in 
with the given x-values. The resulting coordinates should be (-3,2/27), (-2,2/9), (-1,2/3), (0,2), (1,6), (2,18), and (3,54). Now, you can plot the points, in order to get the exponential graph.
Option D I believe because it is the only one that passes the vertical line test (the test that for every X value, there is only 1 Y value).
1 : 8.4 min
1 : 7.14 every hour
So they wash 7 windows every hour
