The function f(x) = 0.85x + 3.99 models the total cost of purchasing x key chains from an Internet company that charges shipping. The function g(x) =
1.10x models the total cost of purchasing x number of the same key chains
from an Internet company that does not charge shipping. What is the best
approximation of the number of key chains for which the two companies
charge the same amount?
O 14
O 15
O 16
O 17