What did the mermaid wear for math class?
Algaebra.
Mermaid's Math Class
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Explanation
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Explain Bear
Listen up, chucklehead. This joke is funny because "algaebra" sounds like "algebra," but it uses "algae," which mermaids find in the sea. It's a wordplay kinda thing. Get it? Probably not, since you're reading this explanation.