Marquis wants to work at least `20` hours this week to earn enough money to go to a concert.

To represent the situation where Marquis wants to work at least 20 hours, you need an inequality that includes 20 hours and everything above it. Therefore, the correct inequality is:

\( x \geq 20 \)

This means that Marquis needs to work 20 hours or more.

The inequality \( x \geq 20 \) means "x is greater than or equal to 20." So, if we're specifically looking at the terms you mentioned, it is greater than or equal to (≥).

To clarify:

• Greater than means \( x > 20 \)
• Less than means \( x < 20 \)
• Less than or equal to means \( x \leq 20 \)
• Greater than or equal to means \( x \geq 20 \)

Since Marquis wants to work at least 20 hours, the correct phrase is "greater than or equal to."