If the cotangent and tangent are reciprocals of each other, then what is the cotangent of an angle if the tangent of the same angle is a/b where a and b are not zero?

12 point are triangles pqr and stu congruent? what is the congruency that proves they are congruent? what is the perimeter of triangle pqr?

Use set builder notation to represent the following set: { -3, -2, -1, 0}

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning