Read This! Ten Black Dots

Hi! It's Caroline again. I also read a book called Ten Black Dots by Donald Crews.

In the back of the book it shows a graph like this:

1   *

2   **

3   ***

4   ****

5   *****

6   ******

7   *******

8   ********

9   *********
10 **********

How many dots are there? How many dots would there be if the graph went to 50? Explain how you found the answers.