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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.What is the selling price of the 15 biscuits

Answer :

nobillionaireNobley
f(x) = 4/5 (x + 4)
g(x) = 4x + 5
g(f(x)) = 4(4/5 (x + 4)) + 5 = 16/5 (x + 4) + 5
g(f(15)) = 16/5 (15 + 4) + 5 = 16/5 (19) + 5 = 60.80 + 5 = 65.80

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