Once a hot-air ballon reached its highest point it dropped 25 feet then five minutes later it dropped another 13 feet find its total change in altitude during this time

Given right triangle xyz, which correctly describes the locations of the sides in relation to

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?