Christine used 12 cubes to make this 3-step staircase. if she uses a total of 56 cubes to make a similar staircase, how many steps will the staircase have? think of using objects to you solve this problem.

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answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb