What is the image of point A(4, 2) after the composition of transformations defined by, a rotation of 90 degrees CCW and a Reflection over the line y = x?

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?

Solving algebraic equations 2m+3=11

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14