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10-22.

Copy the dot pattern below and draw Figures , , and . 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 groups of 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 , where is the figure number.
Use this to help you draw the next figures.

Figure 2 has 4 arms, each with 2 dots circled, plus a dot in the middle dot.