Greater x and Lesser x

Use set builder notation to represent the following set: { -3, -2, -1, 0}

What is the 12th term of b(n)=-4-2(n-1)

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