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
?
where x is the wattage of the lamp.
?
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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