Solve the problem.The price p and the quantity x sold of a certain product obey the demand equation p = - 
x + 180, 0 ? x ? 540.What quantity x maximizes revenue? What is the maximum revenue?
A. 405; $18,225
B. 270; $24,300
C. 540; $24,300
D. 135; $18,225
Answer: B
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Solve the inequality 
. Round your answer to two decimal places.
?
A. 
B. 
C. ?
D. 
Solve the problem. Round dollar amounts to the nearest cent. Use ordinary interest unless otherwise indicated.Chris Owens bought a new computer system. To pay for the system, he borrowed 
from the credit union at 10
% interest for 110 days. Find the interest.
A. $339.97 B. $103.88 C. $102.46 D. $102.93
Solve the system.
A. x = 4, y = -2, z = 1, w = -4 B. x = -2, y = 4, z = 3, w = -5 C. x = 4, y = -2, z = -7, w = -4 D. x = 3, y = 0, z = -1, w = 0
Solve.An arrow is fired straight up from the ground with an initial velocity of 
per second. Its height, 
in feet at any time t is given by the function 
Find the interval of time for which the height of the arrow is greater than 
A. before 
sec or after 
sec
B. before 
sec
C. after 
sec
D. between 
and 
sec