Answer:12/87
Step-by-step explanation: You first have to add up all of the birds present. Then you have to see how many of the type you are looking for is there. The number of the type of bird goes on top of the number of total birds.
It is how much the x values can expand on a graph
The slope of CD is

The slope of the perpendicular bisector is the negative reciprocal,

The perpendicular bisector passes through M, the midpoint of CD
M =( (0+2)/2, (-4 + 6)/2) = (1, -1)
So point slope form for the perpendicular bisector is

Solving for y gives slope intercept form.

Not sure how to type that without spaces; we didn't have online homework back then.
Answer: y=(-1/5)x-4/5