8. Consider the following sequence of figures and how each one is generated from the previous figure. Count the number of squares in each figure and determine the pat-
tern in this sequence. Write an expression for the number of squares in the nth figure.
3n

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Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

50 ! pls ! 12.  building codes regulate the steepness of stairs. homes must have steps that are at least 13 inches wide for each 8 inches that they rise.

a. discuss how to find the slope of the stairs.
b. describe how changing the width or height affects the steepness of the stairs.