If I'm correct, X=1/2. I'm almost completely sure
Answer:
X=4
Step-by-step explanation:

For this one, instead of breaking it down into 3 shapes we can simply subtract the missing square area from the total enclosing area...
15*8-4*4
120-16
104 cm^2
The coordinate (5,-6) lies in the fourth coordinate, because the first is x positive y positive, the second is x negative and y positive, the third is x negative and y negative, and the fourth is x positive y negative. This is x positive y negative, so it is in the fourth quadrant.
Well since there was 560 students the it was 560/560. now that 50 got selected the total portion would be 560/6