*This chapter covers*

- Defining and using scalar (real), vector (list), and matrix variables
- Performing computations on one-dimensional (1D) lists of numbers
- Working with two-dimensional (2D) matrices of numbers

In chapter 1, you saw how to solve the Quadratic Formula when you’re given values for *a*, *b*, and *c*. In that example, which took up the whole of section 1.1.2, you saw how numbers could be temporarily stored in variables `A`, `B`, and `C` on your calculator. In chapter 2, you saw another special variable called `Ans`. In each case, those variables were containers where numbers could be stored and later used. In fact, a variable on your calculator is almost exactly like a variable in algebra class. ...

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