△ PQR is rotated by 180° in a counterclockwise direction about the origin to obtain △ P′Q′R′. What are the coordinates of △ P′Q′R′?

Let r = 3. what is the value of r + 58?

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how