PLEASE HELP I NEED THIS

Is the power produced directly proportional to the wind speed, give reasons for your answer?

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?

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read