The number of lumens (time rate of flow of light) L from a fluorescent lamp can be approximated by the model
?
L = -0.294x2 + 97.744x- 664.875, 20 ? x ? 90
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where x is the wattage of the lamp.
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Use a graphing utility to select the graph of the function. Use the graph to estimate the wattage necessary to obtain 2400 lumens.
?
A. ?
40W
B. ?
30W
C. ?
45W
D. ?
25W
E. ?
35W
Answer: E
Mathematics
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?
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