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a.
For figure 1, the number of dots are 1+4 = 5
For figure 2, the number of dots are 1+4+4 = 9
For figure 3, the number of dots are 1+4+4+4 =13

So for figure 4, the number of dots are 1+4+4+4+4 = 17 #

b. Generalizing, if n is the nth term, then the number of dots = 1+4n

So, for figure 26, the number of dots = 1+4(26) = 105 #

c. 1+4n = 409
4n = 409-1 = 408
So, n = 102 #

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