where is the blue dot on the number line?

Explanation:

Step1: Determine the interval size

The distance between -4.5 and -5 is 0.5, and there are 5 equal - sized intervals. So each interval is $\frac{0.5}{5}=0.1$.

Step2: Locate the blue - dot position

The blue dot is 2 intervals below - 4.5. So we subtract $2\times0.1$ from - 4.5. The value is $-4.5-2\times0.1=-4.7$.

Answer:

$-4.7$