Questa risposta è uguale alla mia.

Because risposta is a feminine singular noun, and questa has to agree with it.

• questo = this, for masculine singular nouns
• questa = this, for feminine singular nouns

So:

• questa risposta = this answer

If the noun were masculine, you would use questo instead.

In Italian, every noun has grammatical gender, usually masculine or feminine. Risposta is a feminine noun, so the words connected to it must match that gender.

That is why you get:

• questa risposta
• la mia risposta

and not masculine forms like questo risposta or il mio risposta.

A lot of nouns ending in -a are feminine, and risposta follows that common pattern.

È means is.

It comes from the verb essere = to be.

The accent is important because:

• è = is
• e = and

So the accent shows that this is the verb, not the conjunction.

In this sentence:

• Questa risposta è uguale alla mia.
• This answer is equal/the same as mine.

In Italian, uguale normally goes with the preposition a, meaning equal to or the same as.

So:

• uguale a me = equal to me
• uguale al libro = equal/the same as the book
• uguale alla mia = equal/the same as mine

This is just the standard pattern: uguale + a.

It is similar to how some English adjectives naturally go with certain prepositions.

Because alla is a contraction of:

• a + la = alla

Here, la is the feminine singular definite article.

So the structure is:

• uguale a la mia → uguale alla mia

Italian usually contracts these combinations:

• a + il = al
• a + lo = allo
• a + la = alla
• a + i = ai
• a + gli = agli
• a + le = alle

So alla mia is the correct form.

Because here mia is standing in place of a noun. In English we say mine, but Italian often uses the possessive with the article:

• la mia = mine / my one
• il mio = mine / my one
• le mie = mine / my ones

In alla mia, the noun risposta is understood but not repeated.

So:

• alla mia really means alla mia risposta

The full version would be:

• Questa risposta è uguale alla mia risposta.

But Italians normally avoid repeating the noun when it is obvious.

Yes, literally it is something like to mine or to my one, because of the preposition a after uguale.

But in natural English, you would translate the whole phrase more smoothly as:

• the same as mine
• equal to mine

So although the Italian contains a, you should not force a word-for-word translation. The important thing is the Italian pattern:

• uguale a qualcosa
• uguale a qualcuno

Not exactly.

Uguale means equal, identical, or the same as in the sense of similarity or matching.

Lo stesso / la stessa often means the same one.

Compare:

• Questa risposta è uguale alla mia.
  = This answer is the same as mine / matches mine.

• Questa è la stessa risposta.
  = This is the same answer.

So uguale compares two things, while lo stesso / la stessa often identifies something as being the very same item.

In many everyday contexts, both can sound similar in English, but they are not always interchangeable.

Yes. That is also correct.

It simply changes the focus:

• Questa risposta è uguale alla mia.
  = This answer is the same as mine.

• La mia risposta è uguale a questa.
  = My answer is the same as this one.

The meaning is basically the same, but the starting point changes. Italian, like English, can shift emphasis depending on what comes first.

Yes, you can say:

• Questa risposta è uguale alla mia risposta.

It is grammatically correct, but it sounds more repetitive. Italian usually prefers the shorter version:

• Questa risposta è uguale alla mia.

Once risposta is already clear, repeating it is often unnecessary.

It would become:

• Queste risposte sono uguali alle mie.

Here is what changed:

• questa → queste
• risposta → risposte
• è → sono
• alla mia → alle mie

Everything agrees in number, just as it does in gender.

Yes, it is natural and correct.

A native speaker would understand it easily. Depending on context, they might also say things like:

• Questa risposta è come la mia.
• Questa risposta è identica alla mia.
• Questa risposta è la stessa della mia.

But Questa risposta è uguale alla mia is perfectly normal and clear.