Awnser with one step/ two step equations

Write a recursive sequence that represents the sequence defined by the following explicit formula:

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

Two parallel lines are crossed by a transversal.what is value of x