Elevator 1 moved up 12 feet from the ground level. It’s position is labeled as +12. Elevator 2 moved down 7 feet from the ground level. It’s position is labeled as .(use the hyphen for negative such as -1)

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?

Name the most appropriate metric unit for each measurement

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?