This looks confusing. I apologise.
Answer:
C
Step-by-step explanation:
690
Round from the tens place.
84.5
12.3(3)+11.9(4)=84.5
The answer is A and E
x2+(y−3)2=36
x^{2}+(y+8)^{2}=36x2+(y+8)2=36
1,3) no solution
2,4,5,6,7) solution