Hello,
If center is (0,0)
x²/a²+y²/b²=1 for a half horizontal axis of a, and a half vertical axis of b
Here
a=2 ==> a²=4
b=8 ==> b²=64

Its .097. Just move the decimal
Decigrams are 100 times bigger than milligrams, so convert 8 decigrams to 800 milligrams. Than subract: 800-3= 797
The flea weighs 797 milligrams more than the ant.
Answer: C
Step-by-step explanation: I hope this helps :)