I want to know if I’m correct Is the side AB and DE?

(Look at the picture for a better explanation)

What is x and y intercepts for y=x+7

Find the domain of the following expression: 1/(√x)-2

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?