#### Answer

(a) $30^o$ F
(b) $0^o$ F

#### Work Step by Step

Use the table to find the "windchill" temperature.
(a)
$40^o$ F is in the 2nd column while $20$ mph wind is in the 5th row of the first column.
The intersection of the 5th row and the 2nd column is $30$.
Thus, the "windchill" temperature is $30^o$ F.
(b)
$20^o$ F is in the 6th column while $35$ mph wind is in the 8th row of the first column.
The intersection of the 8th row and the 6th column is $0$.
Thus, the "windchill" temperature is $0^o$ F.