Prove it cotA - tanA = 2cot2A

Dilations map circles to circles and ellipses to ellipses with the same. true or false

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?

Atransformation t : (x, y) (x-5,y +3) the image of a(2,-1) is