Jodi traded $3400 for chinese yuan, immediately changed her mind, and then
promptly traded her chinese yuan back into dollars. which of these amounts
is she most likely to have?
o a. $0
o b. more than $3400
o
c. more than $0 but less than $3400
o
d. $3400

C. More than $0 but less than $3400

Step-by-step explanation:

Logically one may think that if the exchange rate doesn't change then Jodi would get the same amount of money back that she traded. The key part of the question is which amount is she "most likely" to have. Almost all exchanges require flat fees in order to accommodate workers and trading. Jodi would probably get most of her money back, but not all $3400 dollars.

tube or goog would be a great resource to with that question

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this