A coordinate axis is drawn with a parabola pointing up that has vertex of 0,3. Determine the intervals on which the function is increasing, decreasing, and constant. Increasing x < 0; Decreasing x > 0 Increasing x > 0; Decreasing x < 0 Increasing x < 3; Decreasing x > 3 Increasing x > 3; Decreasing x < 3

They both will have 128 stamps in 6 months.
Equation- 56+12x= 80+8x
solution x=6 (in 6 months they will have same stamps)
plug 6 into both equations to figure out how many stamps.
56+12*6=128 (xians equation) 
80 +8*6= 128 (kais equation) 
Hope this helped!