Bailey draws a circle on a large piece of paper. then she cuts out the circle, cuts along the radius of the circle, and tapes the sides together to form a cone. the formula v = 13πr2h gives the volume, v, of the cone with radius, r, and height, h. bailey knows the volume and radius of her cone, and she wants to determine the height. which equation shows the formula solved for h?

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?