S(-4, -6) and T(-7, -3); Find R.

Convert 16 yards to feet use the conversion rate 3 feet = 1 yard

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

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?