"It is my computer."
Translation:Es mi computadora.
Yes, sounds like you are talking to a person with exceptional math skills.
1) "Esta" is a feminine form, meaning "this," and is incorrect because it is nonsensical in this context ("this my computer").
2) "Está" is the third person singular of "Estar," meaning "to be," and is incorrect because the sentence relates to possession.
3) "Es" is the third person singular of "Ser," meaning "to be," and is correct because Ser is used to indicate possession.
In my opinion, "this my computer" sounds better than "is my computer", and isn't 'es mi computadora' translated to 'is my computer'?
I think esta is "this", but I'm not a native Spanish speaker...so I'm not positive
it's wrong: what you wrote means "he is my computer". in this case, omit the pronoun and you'll be fine.