In April of 1869, he obtained a patent for one of his most important inventions, the air brake. This device enabled trains to be stopped with fail-safe accuracy by the locomotive engineer for the first time and was eventually adopted on the majority of the world's railroads
I believe that it is 3. Africa
i looked the answer up it gave me that answer but it didnt give me a clear answer so tell me if i am wrong hope it helps :)
Do u go to k12 cause i reconize ur name
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<u><em>Answer:</em></u>
A = P(1 + r)^t
A = 400(1 + .04)^1
A = $416
Hope This Helps! Have A Nice Day!!
