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I need help with this

User Saliha
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1 Answer

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\begin{gathered} BC\text{ and CD are perpendicular, which means that m}\angle C=90\text{ degrees} \\ \\ \text{The problem says that m}\angle C=5x+15 \\ \\ 5x+15=90\text{ Because they're referring to the same angle} \end{gathered}

User Amazingred
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