1.

A certain freezing process requires that room temperature be lowered from \[{{40}^{o}}C\] at the rate of \[{{5}^{o}}C\] every hour. What is the room temperature after 10 hours?

A.  \[-\,46{}^\circ C~\]                 
B.  \[-18{}^\circ C\]
C.  \[-10{}^\circ C\]          
D.  \[-25{}^\circ C\]
Answer» D.  \[-25{}^\circ C\]


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