WILL GIVE 45/ALL MY POINTS FOR THE ANSWER I need help with this, Please and thank you!

Which one of the following is correctly written as a therochemical equation??​

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

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