What is the angle of the measurement whose angle is 4 times its complement?

What signals you that factoring by grouping is the best method to use when factoring a problem?

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

See attachment below and find the equivalent of tan(∠qsr)