The time the planet takes to revolve once around sun relates directly to 3/2 power of planets average distance from sun in millions of kilometers
Thus t = f(d) = kd^3/2
If it takes earth one year to revolve around sun at the average distance of 150,000,000 km, find value of k and write the equation for f(d)
use this f(d) to determine how many earth years it takes for Mercury to revolve once around sun if average distance from sun is 58,000,000 km.
Is this the irrational function and does it have restricted domain.