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What interval consists of all u such that neither 2u nor -20u is in the interval \( (-\infty,-1)\)?

please answer!

 Aug 13, 2020
edited by Guest  Aug 13, 2020
edited by Guest  Aug 14, 2020
edited by Guest  Aug 14, 2020
 #1
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Solve these for u

 

\(-1 \le 2u < +\infty\\ and\\ -1 \le -20u < +\infty\\\)

 

and find the intersection of the two.

 Aug 14, 2020

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