The answer is A. Let me know if you need an explanation.
Answer:
3
Step-by-step explanation:
f(x) = 2x^2 + 1
f(-1) means that wherever you see an x on the right hand side, you substitute -1.
f(-1) = 2(-1)^2 + 1 = 2 + 1 = 3
(12,756 kilometers) - (4,879 kilometers) = 7,877 kilometers
