Help me! it's khan acadamey assignment and the due date is *:)) exact

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

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