The answer is x=4 or x= minus 5 i mean D.
Answer:

Step-by-step explanation:
Let x = the number of all the species of birds sighted in the park
“300 species of birds that migrate. This accounts for 2/7 of all the species of birds sighted in the park”
the above sentence means “(2/7)x = 300”
now we can solve it :
(2/7)x = 300
⇔ 2x = 7×300
⇔ 2x = 2100
⇔ x = 2100/2
⇔ x = 1050
The fourth one, (3,-6), (3,-4), (6,-4), (6,-6)
45 rolls are in a group and 27 rolls are in the other group
Didn't get the question quite well...