¿en qué valor en la recta numérica está el punto azul?

¿en qué valor en la recta numérica está el punto azul?
Answer
Explanation:
Step1: Find the interval length
The distance between 9 and 13 is $13 - 9=4$. There are 2 intervals between 9 and 13, so the length of each interval is $\frac{4}{2}=2$.
Step2: Determine the value of the blue - point
The blue - point is 2 intervals to the right of 13. So the value is $13+2\times2$. $13 + 2\times2=13 + 4=17$.
Answer:
17