SAT Question 2869fe95: Linear Inequalities answer and explanation with Desmos solution

Choice C is correct. It's given that for a $3$ -week period in a town in Illinois, the lowest recorded temperature was $31^{\circ }\text{F}$ and the highest recorded temperature was $67^{\circ }\text{F}$. It follows that the inequality $31\le t\le 67$ is true for any recorded temperature $t$, in ${}^{\circ }\text{F}$, in this town for this $3$ -week period.