### Home > CC1 > Chapter 8 > Lesson 8.3.2 > Problem8-105

8-105.

Copy the dot pattern below and draw Figures $0$, $4$, and $5$. Explain how you could know the number of dots in any figure if you knew the figure number.


Could you write an expression to find the number of dots in a figure?

Look at Figure 2 to the right where $4$ groups of $2$ dots (the figure number) are circled and and the middle dot is left over.
An expression representing the number of dots in this figure would be $1 + 4x$, where $x$ is the figure number.