The Number of Lumens (Time Rate of Flow of Light)

question 124

Multiple Choice

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