What is the value of the function y = 3/4x - 5 for x = -4

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

Me. i can't figure out this question. give an explanation too. .

Need showing work for this problem 56.25 ×25.80