Solve the problem.The decibel level D of a sound is related to its intensity I by 
. If I0 is 10-12, then what is the intensity of a noise measured at 50 decibels? Express your answer in scientific notation, rounding to three significant digits, if necessary.
A. 5 × 10-10 watt/m2
B. 1 × 10-6 watt/m2
C. 1.48 × 1014 watt/m2
D. 1 × 10-7 watt/m2
Answer: D
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For the function f whose graph is given, determine the limit.Find
f(x).
A. 1 B. -1 C. does not exist D. 0
Find the extreme values of the function and where they occur.f(x) = x2 + 2x - 3
A. Absolute minimum is 1 at x = 4. B. Absolute minimum is -1 at x = 4. C. Absolute minimum is -4 at x = -1. D. Absolute minimum is 1 at x = -4.
Identify the sequence as arithmetic, geometric, or neither.9, -9, 10, -10, 11, -11, . . .
A. Arithmetic B. Geometric C. Neither
Find the center, foci, and vertices of the ellipse.64x2 + y2 - 640x + 1536 = 0
A. (x - 8)2 + 
= 1
center: (8, 0); foci: (8, 2
), (8, -2
); vertices:(8, 5), (8, -5)
B. 
+ (y - 8)2 = 1
center: (8, 0); foci: (8, 2
), (8, -3
); vertices:(8, 5),
(8, -5)
C. 
+ (y - 5)2 = 1
center: (5, 0); foci: (5, 3
), (5, -3
); vertices:(5, 8), (5, -8)
D. (x - 5)2 + 
= 1
center: (5, 0); foci: (5, 3
), (5, -3
); vertices:(5, 8), (5, -8)