The cost function will be of the form f(x) = x + 29.
A function have a set of dependent variable for the given or specified independent variable.
According to the given question Recycled CDs, Incorporated, offers a choice of 5 used CDs for 29 dollars with each additional CD costing a dollar.
We have to write a function for purchasing 5 or more CDs where x represents the no. of CDs over 5.
Let f(x) represents the cost of CDs.
∴ f(x) = x + 29.
Here the constant 29 dollars represents the cost of 5 CDs and x represents no. of CD's over 5.Put x = 0 and the cost for 5 CDs will be 29 and for any more value of x we will get our desire result.
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