After exercising for a few minutes, a person has a respiratory cycle for which the velocity of airflow is approximated by
?
,
?
where t is the time (in seconds).
(Inhalation occurs when v> 0 and exhalation occurs when v< 0.)
Select the graph of this velocity function.
A. 
B. 
C. 
D. 
E. ?
Answer: D
Mathematics
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Solve.If y varies inversely as x, and y = 
when x = 30, find y when x = 6.
A. 1
B. 
C. 
D. 36
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Subtract.(6x2y - 5xy + 5xy2) - (3xy - 3xy2 + 4x2y)
A. 5x2y + 5xy2 - 8xy B. 2x2y - 8xy2 - 2xy C. 2x2y - 8xy2 - 8xy D. 2x2y + 8xy2 - 8xy
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Simplify the complex fraction.
A. 
B. 
C. 
D. 
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Use the trapezoidal rule and Simpson's rule to approximate the value of the definite integral. Please give the answer to four decimal places.
?
?
A. By trapezoidal rule 1.0271, by Simpson's rule 1.1893 B. By trapezoidal rule 0.9083, by Simpson's rule 0.7109 C. By trapezoidal rule 1.1902, by Simpson's rule 1.1677 D. By trapezoidal rule 0.8126, by Simpson's rule 0.5496 E. By trapezoidal rule 1.4060, by Simpson's rule 0.7978
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