W/4 + 12.5 - 7z what term has a coefficient

Pls help me.

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

The graph shows the decibel measure for sounds depending on how many times as intense they are as the threshold of sound. noise in a quiet room is 500 times as intense as the threshold of sound. what is the decibel measurement for the quiet room? 20 decibels28 decibels200 decibels280 decibels

Simplify the given expression leaving the answer in improper fraction form. 2/3+5/6