Help me please It’s a test I need help ASAP

Write the pair of fractions as a pair of fractions with a common denominator

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?

Which of the following shows the length of the third side, in inches, of the triangle below