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Debora [2.8K]
4 years ago
6

The product of 4 and a number x is at least 21

Mathematics
1 answer:
ra1l [238]4 years ago
7 0
the\ product\ of\ 4\ an\ number\ x\to4\cdot x=4x\\\\4x \ \textless \  21\ \ \ \ |divide\ both\ sides\ by\ 4\\\\x \ \textless \  \dfrac{21}{4}\to x \ \textless \  \dfrac{20+1}{4}\to x \ \textless \  \dfrac{20}{4}+\dfrac{1}{4}\to x \ \textless \  5+\dfrac{1}{4}\\\\\huge\boxed{x \ \textless \ 5\frac{1}{4}\to x\in\left(-\infty;\ 5\frac{1}{4}\right)}

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