Rational formulas and variations

Iam in need of a tutor for my son in the northern ky area. can anybody me out

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

Koji is installing a rectangular window in an office building. the window is 823 feet wide and 534 feet high. the formula for the area of a rectangle is a=bh. what is the area of the window? enter your answer as a mixed number in simplest form in the box. $$ ft2