Is 26.22 rational or irrational

Give all possible names for the line shown.calculation tip: lines can be written with either point first.

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?

Simplify the given expression leaving the answer in improper fraction form. 2/3+5/6