Point D(2, 4) is rotated 180° about the origin, what is the coordinate of D’? A. (-4, 2) B. (4, -2) C. (-2, -4) D. (-4, -2)

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).