What is 60-40ab factor each polynomial

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

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

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)