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When the wind speed is 9 miles per hour, the wind-chill

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Senior Manager
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When the wind speed is 9 miles per hour, the wind-chill [#permalink] New post 16 Nov 2007, 08:13
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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
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 [#permalink] New post 16 Nov 2007, 18:16
should be E. together all you know is that t is between 10 and 20
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Re: DS: windchill factor [#permalink] New post 16 Nov 2007, 22:48
gluon wrote:
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


E.

stat 1: if t = 11 then w<0>0; insuff

stat 2: if t = 19 then w>0 if t = 11 then w<0; insuff.

together: same as stat 2. Insuff.
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Re: DS: windchill factor [#permalink] New post 16 Nov 2007, 22:52
gluon wrote:
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.

E
Re: DS: windchill factor   [#permalink] 16 Nov 2007, 22:52
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When the wind speed is 9 miles per hour, the wind-chill

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