Abcd is dilated by a factor of 2 the coordinate of A' would be? PLEASE HELP

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

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?

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost