Which expression illustrates the associative property of addition? a. (3 19) – 12 = (3 12) – 19 3
b. (19 – 12) = 3 (19 12)
c. (3 19) – 12 = 3 (19 – 12) 3
d. (19 –12) = 3 – (19 12)

12. decide whether each statement is always true, sometimes true, or never true. a. when corresponding points of an original figure and its reflection are connected, the resulting segments are all perpendicular to the line of reflection. b. when a point is reflected over a horizontal line, the y-coordinate of the point stays the same. answer both questions and explain

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?

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle