Solve the problem.A magazine earned $74 million in 1998 from advertising revenue and subscriptions. If the advertising revenue was 7 times the subscription revenue, how much did the magazine earn from advertising?
A. $0.9 million
B. $129.5 million
C. $64.8 million
D. $9.3 million
Answer: C
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Use implicit differentiation to find dy/dx.2xy - y2 = 1
A. 
B. 
C. 
D. 
Solve the problem.A field microphone used at a soccer game has a parabolic cross section and is 26 inches wide at the opening. The focus is 25 inches from the vertex. Find the depth of the microphone.
A. 1.69 in. B. 27.04 in. C. 6.76 in. D. 0.75 in.
Select from the list of numbers all that belong to the specified set.Rational numbers16, 
, -20, 0, 
, 
, 
, 0.48
A. 16, -20, 0, 
, 
, 0.48
B. 
, 
, 0.48
C. 
, 
D. 16, 0, 
Solve.The time in hours it takes a satellite to complete an orbit around the earth varies directly as the radius of the orbit (from the center of the earth) and inversely as the orbital velocity. If a satellite completes an orbit 
above the earth in 
at a velocity of 
how long would it take a satellite to complete an orbit if it is at 
/> above the earth at a velocity of 
(Use 
as the radius of the earth.)
A. 50.48 hours
B. 7.67 hours
C. 26.67 hours
D. 266.69 hours