What is the square root of 45? (step by step working plz)

Is a currency whose value is tied to another currency, meaning that the exchange is fixed

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?

Finding tbe values of the variables in each kite