I need to double check my work please.

Revise to create pronoun-antecedent agreement and eliminate the generic he and any awkward pronoun reference.

1) While shopping for a new computer for school, I noticed that a laptop costs much less then they use to.
A) While shopping for a new computer for school, I noticed that a laptop costs much less then it use to.

2) Congress usually resists a president’s attempt to encroach on what they consider their authority.
A) Congress usually resists a president’s attempt to encroach on what is considered their authority.

3) Macro and Ellen were each given a chance to voice their opinion.
A) Macro and Ellen were given a chance to voice their opinion.

4) An emergency room doctor needs to be swift and decisive; he also needs to be calm and careful.
A) An emergency room doctor needs to be swift and decisive; while also being calm and careful.

5) Every dog and cat has their own personality.
A) Dogs and cats have their own personality.

All are correct.

Note, though the following corrections:

1. used to (not use to)

3. their opinions

And in 1, it's "than" not "then."

1) While shopping for a new computer for school, I noticed that a laptop costs much less than it used to.

To revise this sentence for pronoun-antecedent agreement and eliminate the generic pronoun reference, we need to change "they" to "it" to agree with the singular noun "laptop." We also need to change "use" to "used" to show past tense.

2) Congress usually resists a president’s attempt to encroach on what is considered its authority.

To revise this sentence, we need to change "they" to "its" to agree with the singular noun "Congress." The pronoun "its" indicates possession for "Congress" and follows the rule of pronoun-antecedent agreement.

3) Macro and Ellen were given a chance to voice their opinion.

This sentence does not need any revisions since it already has proper pronoun-antecedent agreement. The plural pronoun "their" correctly refers to the plural antecedent "Macro and Ellen."

4) An emergency room doctor needs to be swift and decisive, while also being calm and careful.

To revise this sentence, we can eliminate the use of the generic pronoun "he" and instead use a coordinating conjunction like "while" to connect the two qualities of an emergency room doctor. This revision maintains clarity and avoids any potential awkwardness or gender bias.

5) Dogs and cats have their own personality.

To revise this sentence, we need to change "their" to "its" to agree with the singular noun "personality." When referring to a possessive form for a combined noun like "dogs and cats," it is more appropriate to use the singular pronoun "its" for agreement.