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Please look at the image
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5 votes
Please look at the image

Please look at the image-example-1
User Wazoox
by
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1 Answer

3 votes

Answer:


r \geqslant - 5

Explanation:


50 - 4r \leqslant 70


- 4r \leqslant 20


( - 4r)/( - 4) \geqslant (20)/( - 4)


r \geqslant - 5

User Minghui Yu
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