A square rotated about its center by 360 maps onto itself at (blank) different angles of rotation. You can reflect a square onto itself across (blank) different angles of rotation

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?

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle

Factor the polynomial by its greatest common monomial factor.