7. John made a pattern with 9 toothpicks in the 1st figure, 14 in the 2nd figure, 19 in
the 3rd figure, and 24 in the 4th figure.
a) Write an algebraic expression for the
nth term.
b) Use a scatter plot to determine the figure
number of the figure with 94 toothpicks.
c) Check your result in part (b) by
substituting for the variable and
evaluating the algebraic expression.

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