Solve the problem.The demand function for a certain product is given by:D(p) = 
.Find the marginal demand D'(p).
A. D'(p) = 
B. D'(p) = 
C. D'(p) = 
D. D'(p) = 
Answer: D
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Solve the given applied problems involving variation.The pitch P of a musical tone varies inversely as its wavelength W. One tone has a pitch of 479 vibrations per second and a wavelength of 8.8 ft. Find the wavelength of another tone that has a pitch of 492 vibrations per second.
A. 0.000037 ft B. 0.12 ft C. 26,780.5 ft D. 8.6 ft
Answer as indicated in a complete sentence.Harry caught a fish weighing 35 pounds 15 ounces and then caught a second fish weighing 
How much more did the first fish weigh?
A. The first fish weighed 7 pounds 5 ounces more than the second. B. The first fish weighed 6 pounds 5 ounces more than the second. C. The first fish weighed 63 pounds 9 ounces more than the second. D. The first fish weighed 64 pounds 9 ounces more than the second.
Write the fraction.According to a recent study, 10 out of 18 visits to a hospital emergency room were for an injury. What fraction of emergency room visits are NOT injury-related?
A. 
B. 
C. 
D. 
Use technology to calculate det A.A = 
A. -68 B. -18 C. 68 D. -8