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Mathematics 21 Online
OpenStudy (anonymous):

The function for the cost of materials to make a biscuit is f(x) = four-fifths x + 4, where x is the number of biscuits. The function for the selling price of those biscuits is g(f(x)), where g(x) = 4x + 5. Find the selling price of 15 biscuits.

OpenStudy (anonymous):

16 56 65 69

OpenStudy (anonymous):

Please help explain this to me

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