What two numbers have an absolute value of 16

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

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?

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse