What is the slope of the line that passes through the points (4, -6) and (4, -2)?

Apath 3 m wide runs around the inside of a square park inside 60 m. find the area of the path. pls

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

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.