help with math

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Just a first quick note: im not american, so my english is NOT perfect.

I had to do a math problem for my school. I made it, but im not sure if its right.
So i want to ask you 2 things:

1)Have i posted this in the right place? should i do an analogous topic in firebot dev lab?
2)I know there are some really smart guys here. can you help me?

Once i get answers for those questions, i will post the problem and my solution

thank you for the attention
 
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