I need an answer NOT A LINK! ASAP!

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

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)