1) Equilateral triangles are defined as triangles with 3 equal sides, so some triangles must have 2 or more equal sides.

2) Some birds are pets, birds aren’t cats or dogs, so not all pets are cats and dogs

Just think of an example that disproves it, and say why it disproves it.

2. A goldfish is a pet. (this proves that all pets are not cats and dogs.)

2. A person could have a guinea pig (for example) as a pet.

Basically, you just have to prove the conjecture wrong.

Good luck.

2. any domesticated or tamed animal that is kept as a companion and cared for affectionately (i.e. fish, rabbit, etc.)

Like, if your phrase was “All sodas are made by Pepsi.” You could disprove is by giving an example of a non-Pepsi soda, such as Coca-Cola.

🙂 Got it?