In a lab, the temperature of a fluid was reduced
7
∘
\displaystyle {7}^{\circ}
7
∘
per hour for
9
\displaystyle {9}
9
hours. What signed number represents the
overall
change in temperature over the
9
\displaystyle {9}
9
hour period?
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Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity