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
You might also like to view...
Evaluate the integral.
A. cot ? - csc ? + C B. cot2 ? + csc ? + C C. csc2 ? - cot ? + C D. cot ? + csc ? + C
Mathematics
Solve the problem.Find f(k) when f(x) = 3x2 + 4x + 5.
A. 3k2 + 4k + 25 B. 9k2 + 16k + 25 C. 3k2 + 16k + 5 D. 3k2 + 4k + 5
Mathematics
For the pair of functions, perform the indicated operation.f(x) = x3 + 3x2, g(x) = 
Find (f + g)(x).
A. x3 +
B. x3 + 3x2 + x - 8
C. x3 + 3x2 + 
D. 
Mathematics
Find the LCM of the set of numbers.8, 12
A. 20 B. 12 C. 96 D. 24
Mathematics