Evaluate x+3y when x=2, y-3

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.

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

What is an alternate exterior angle