Write the following as intervals: (i) $\{x, x \in R, 0 \leq x<7\}$ (ii) $\{x: x \in R, 3 \leq x \leq 4\}$

Solution:

(i) $\{x . x \in \mathrm{R}, 0 \leq x<7\}=[0,7)$

(ii) $\{x: x \in \mathrm{R}, 3 \leq x \leq 4\}=[3,4]$