A rock is thrown from the top of a building which measures 48 foot high. The graph shows the height, y, of the rock from the ground after x seconds. On which interval is the rock's height always decreasing?
A) x > 0
B) 0 < x < 2.5
C) 0 < x < 5.5
D) 2.5 < x < 5.5

D) 2.5<x<5.5

Step-by-step explanation:

an

y = 6x -3y -12

y +3y +12 = 6x

=> . x = { 2y / 3 +2 } this is equation of line in terms of x

=> . if line meets the x-axis the co-ordinates of meeting point would be ( x , 0 )

=> . x = 2 ( 0 ) / 3 + 2

=> . x = 2

so, the point is ( 2 , 0 )