1) The Brady family hikes the South Kaibab Trail down to the bottom of the Grand Canyon. 2
Their elevation changes by an average of -
11
mile per hour for the first 3 hours.
.) Which expressions represent the Bradys' change
in elevation for the first three hours of their hike?
Choose ALL that apply.
3:
(
: 3
( ^) + (-1) + ( )
3
3

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?