2. The function below represents the marginal cost (in dollars per litre) for producing q litres of premium homemade cane sugar soda, where 0

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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2. The function below represents the marginal cost (in dollars per litre) for producing q litres of premium homemade
cane sugar soda, where 0 <q<7.
2+ 0<q< 4
(q – 6)2 4<q <7
f(q) =
(a) Sketch a graph of this function below.
4
2 +
0+
4
6
(b) In this part, you will use the idea from #1 and the formula for f to show that f'(4) does not exist.
i. Approaching from the left. Fill in the blanks:
If q < 4, the slope of the secant line through (q, f(q)) and (4, f(4)) is
f(q) – f(4)
Hence, as q approaches 4 from the left,
approaches
9- 4
(You may use the graph to answer this part; you are not required to show your reasoning.)
Transcribed Image Text:2. The function below represents the marginal cost (in dollars per litre) for producing q litres of premium homemade cane sugar soda, where 0 <q<7. 2+ 0<q< 4 (q – 6)2 4<q <7 f(q) = (a) Sketch a graph of this function below. 4 2 + 0+ 4 6 (b) In this part, you will use the idea from #1 and the formula for f to show that f'(4) does not exist. i. Approaching from the left. Fill in the blanks: If q < 4, the slope of the secant line through (q, f(q)) and (4, f(4)) is f(q) – f(4) Hence, as q approaches 4 from the left, approaches 9- 4 (You may use the graph to answer this part; you are not required to show your reasoning.)
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