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When you are multiplying something such as (3x^5y^4)(2x^2y)...do you add or subtract the exponent thingies?? AHHHHHHHHHHHH.

You add exponents when multiplying, and subract the exponents that are in the denominator (or in a divisor).

For the two terms that you wrote, the product would be 6 x^7 y^5

Ohmigosh...thank you sooo much! Your my hero!

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