2x-√x(1-2x) =1
x+√4-x² =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?

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal