Ultrasound waves are used in Indoor Positioning Systems in h…

Ultrasound waves are used in Indoor Positioning Systems in hospitals to detect the location of equipment. If the system must be centrally located in a hospital that measures 860 meters in the east-west direction by 950 meters in the north-west direction, which would be an equation that models the range of the IPS for this hospital? 

Chuck is walking down the street and someone asks him to sig…

Chuck is walking down the street and someone asks him to sign a petition to put clean-air legislation on the next ballot. He decides to sign the petition. Then the person asks whether he would like to give a donation to the associated environmental group. This technique is known as which of the following?