Find the surface area of this prism. (ILL MARK YOU A BRAINLEST IF THE ANSWER IS RIGHT. PLS HELP)

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

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?

I’m really confused and need your assist me with this question i’ve never been taught