The number 72 is the term that does not multiply $x$. What does that tell you about the value of $\hat{y}$ when $x=0$?

Evaluate $\hat{y}$ when $x=0$ to interpret the model at the router.

Enter $y=-3x+72$ in Desmos.

Find the point where the line crosses the $y$-axis (this occurs at $x=0$). Read the corresponding $y$-value.

Choose the option that describes the predicted download speed when the distance from the router is 0 meters.

In the form $\hat{y}=mx+b$, the constant term $b$ is the $y$-intercept. Here, $b=72$.

The $y$-intercept is the predicted value of $\hat{y}$ when $x=0$. So when the distance from the router is 0 meters, the predicted download speed is 72 megabits per second.