Lumens 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.
(a) Use a graphingmtility to graph the function.
(b) Use the graph from part (a) to estimate the wattage necessary to obtain 2000 lumens.
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