What is the length of AC ?

What expression is equivalent to (2x-1)(x-3)?

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?

Given the following linear function sketch the graph of the function and find the domain and range. ƒ(x) = -5x + 4