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If QR = 9 and QS = 17, what is RS?

If QR = 9 and QS = 17, what is RS?-example-1
User Chouser
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\begin{gathered} QR+RS=QS \\ 9+RS=17 \\ 9+RS-9=17-9 \\ RS=8 \end{gathered}

answer: 8 units

User Bunji
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