How many millimeters is 5 killometers​

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?

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x

Benjamin is making bow ties. how many 1/2yards lomg bow ties can he make if he has 18 feet of fabric?