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Lanie.

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8. What happens when a wave reaches the boundary of a new media?A. it would reflect back B. it would continue moving C. either A
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The expression 81 p^4 + 108p^3r^3 + 54p^2r^6 + 12pr^9 + r^12 is the expansion of which binomial?My answer: (3p + r^3)^4
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