Can somebody please explain why y = -x is equivalent to r sin(θ) = r cos(θ) instead of r sin(θ) = - r cos(θ) ? Thank you.

Two rigid transformations are used to map abc to qrs. the first is a translation of vertex b to vertex r. what is the second transformation? a reflection across the line containing ab a rotation about point b a reflection across the line containing cb a rotation about point c

Which formula finds the probability that a point on the grid below will be in the blue area? p(blue) = total number of squares number of blue squares number of blue squares p(blue) = total number of squares number of blue squares p(blue) = number of white squares

What expression is equivalent to (2x-1)(x-3)?