Solve the system of equations:
y=2x+2 ................(1)
y=-2x+a+1............(2)
for x and y
(1)-(2)
4x-a+1=0 => x=(a-1)/4
(1)+(2)
2y=a+3 => y=(a+3)/2
x>0 if (a-1)/4>0 => a>1
y>0 if (a+3)/2>0 => a>-3
For both x & y >0, we have the condition a>1.
Note that if a=1, then the intersection poin lies ON the x-axis, and therefore NOT in quadrant 1.
Survey 3 and 4 is the surveys less likely to be biased, because they are the most alike. :)
You can find the percent then, by doing 27/50.
27/50 = 0.54
0.54 = 54%
Hence the answer is 54%.
Personally i would go with 53% (C) as it is the closest thing to the real answer, and could be a typo, either by you, or the teacher :)
Do you got a better picture
Answer:
3/5
Step-by-step explanation:
1/10+1/20=3/5