Answer:
618 birds.
Step-by-step explanation:
Let the estimated number of birds=x
Out of x birds, he tied a belt around the legs of 40 birds.
When he observed 520 birds, 34 of which had belts.
Expressing each as a ratio

Cross Multiply
34x=520X40
x=520X40÷34=611.7≈618
There are an estimated 618 birds.
The coordinates of the fourth corner is
A. (-1, 3)
No
lets say a and b are positive numbers
that means -a and -b are negative
if you make the difference between these to it'd be
-a-(-b) which means -a+b, and if b>a then the difference is positive
3 is double 6 so the relation ship is that it is doubled