When the wind speed is 9 miles per hour, the wind-chill factor w is given by w = -17.366 + 1.19t, where t is the temperature in degrees Fahrenheit. If at noon yesterday the wind speed was 9 miles per hour, was the wind-chill factor greater than 0 ?
(1) The temperature at noon yesterday was greater than 10 degrees Fahrenheit.
(2) The temperature at noon yesterday was less than 20 degrees Fahrenheit
1: Could be 10.00000000000000000000000000000000000000000001 degrees (just easier to say 10 degrees) or 1million degrees. Insuff.
2: Could be 20 degrees or 0 degrees insuff.
1 and 2: still insuff. Could be 10 degrees or 20 degrees.