Question

Determinati n ∈ N (Multimea numerelor naturale), astfel incat $\frac{4n}{7}$≤$\frac{14}{15}$

Answer 1

$\frac{4n}{7} \leq \frac{14}{15} \\ 15(4n) \leq 14(7) \\ 60n \leq 98 \\ n \leq \frac{98}{60} \\ n \leq \frac{49}{30}$
x∈(-∞,49/30]