Question

In order to receive bonus pay for summer work, Kelly has to work at least 60 hours in her online course. Due to other commitments, she is unable to work more than 120 hours. Use set notation and interval notation to represent the number of hours she can work in the online course.

Answer 1

Let x be the number of hours Kelly can work in the online course. Let's also assume that hours she works can be not only integers, but also rational numbers (e.g. 3.5 hours).

Interval notation: $x \in [60,120]$

Set notation: $\{ x \in Q \; | \;60 \leq x \leq 120\}$