Write the Word or Phrase That Best Completes Each Statement

Write the word or phrase that best completes each statement or answers the question.
-The wind chill factor represents the equivalent air temperature at a standard wind speed that would produce the same
heat loss as the given temperature and wind speed. One formula for computing the equivalent temperature is $$W ( t ) = \left\{ \begin{array} { l l } t & \text { if } 0 \leq v < 1.79 \\33 - \frac { ( 10.45 + 10 \sqrt { v } - v ) ( 33 - t ) } { 22.04 } & \text { if } 1.79 \leq v < 20 \\33 - 1.5958 ( 33 - t ) & \text { if } v \geq 20\end{array} \right.$$ where v represents the wind speed (in meters per second) and t represents the air temperature (°C). Compute the
wind chill for an air temperature of 15°C and a wind speed of 12 meters per second. (Round the answer to one
decimal place.)