Any sound from one focus of an ellipse reflects off the ellipse directly back to the other focus. This property explains whispering galleries such as Statuary Hall in Washington, D.C. The whispering gallery shown in illustration has the shape of a semi-circle. Find the distance sound travels as it leaves focus F and returns to focus F'. Round your answer to one decimal place, if necessary.
?
?
A. 16 meters
B. 16.8 meters
C. 33.5 meters
D. 32 meters
E. 31.2 meters
Answer: C
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Solve the equation.3a = -18
A. {21} B. {1} C. {-21} D. {-6}
Solve.The pressure of a gas varies jointly as the amount of the gas (measured in moles) and the temperature and inversely as the volume of the gas. If the pressure is src="https://sciemce.com/media/4/ppg__10630191635__f1q43g5.jpg" alt="" style="vertical-align: -4.0px;" />.
A. 1120
B. 1040
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D. 520
(kiloPascals) when the number of moles is 8, the temperature is 
, and the volume is 
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, and the volume is
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