Recycled CD, incorporated, offers a choice of 5 used CDs for $21, with each additional CD costing $5. Write a cost function for purchasing 5 or more CDs. What will the cost of buying 6 CDs be? Let x represent the number of CDs over 5.

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step-by-step explanation:

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let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.

answer: the answer is   graph (a)