10-3=7
Ways to write it could be ...
1. 7+3
2. 13-7
The values or the answer is C and F!
Since the Nile river is 6690 long. And the amazon river is 394 longer than the Nile river. You simply add 6690+394 and You get 7084. Which is the length of the amazon river
6690 +394 = 7084
C. i think that is the correct answer