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