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 
(kiloPascals) when the number of moles is 7, the temperature is 
, and the volume is 
, find the pressure when the number of moles is 8, the temperature is 
, and the volume
is 
.
A. 660
B. 750
C. 1680
D. 1500
Answer: B
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A graph of an equation:
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Solve the problem.
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