Help me multi-step equation

If eh = hg and hg=16, find the diameter of k

The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse. a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?

Two numbers have a sum of -19. one number is x. what expression represents the other number?