Solve the problem.Two low-frequency sound waves with similar frequencies, producing the pressures 
and 
combine to form a pressure P = P1 + P2. The variable t is time measured in seconds. Graph P in 
by 
and use the graph to determine the frequency of the displayed beats.
A. 4 beats/sec
B. 11 beats/sec
C. 8 beats/sec
D. 15 beats/sec
Answer: A
Mathematics
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Convert 12,000 pounds to tons.__________ tons
Fill in the blank(s) with the appropriate word(s).
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Find the value of df-1/dx at x = f(a).f(x) = x2 - 4x + 9; a = 4
A. 
B. 
C. 4
D. 
Mathematics
Find the area of the region specified in polar coordinates.the region inside both 
and 
A. 
(? - 1)
B. 
(? - 2)
C. 
(? - 1)
D. 
(? - 2)
Mathematics
Write the given statement as an equation.John kept track of the time it took him to drive to college from his home and the speed at which he drove. He found that the time t varies inversely as the speed r.
A. r = kt
B. t = 
C. t = kr
D. t = 
Mathematics