I think it was skiped can you post resposne in this question
h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 9 8 2 9 1 7 1
Please see the answer I posted at the other post
http://www.jiskha.com/display.cgi?id=1269829171
Tutors are not on here 24/7
It could have been at a time when no math teacher was around.