







Points on the xaxis 
20150314 

From Justin: jamie tells her friend that ordered pairs that have an xcoordinate of O line xaxis. She used the origin as an example. Describe Janine error. Use a counterexample to explain why Janine statement is false Answered by Penny Nom. 





Slicing through a cone to form an ellipse 
20130806 

From Pulkit: we get an ellipse on slicing through a cone. Is there a relation between central axis of the cone and this ellipse?
Does it pass through the any of the foci of the ellipse? Answered by Chris Fisher. 





The Praxis II test 
20020709 

From A student: I am taking the Praxis II test and I can't seem to answer certain styles of questions. Please help!!!!!!  In a class of 29 children, each of 20 children has a dog and each of 15 has a cat. How many of the children have both a dog and a cat?
 If there are exactly 5 times as many children as adults at a show, which of the following CANNOT be the number of people at the show? a. 102 b. 80 c. 36 d. 30
 In order to estimate the population of snails in a certain woodland, a biologist captured and marked 84 snails there were then released back into the woodland. Fifteen days later the biologist captured 90 snails from the woodland, 12 of which bore the markings of the previously captured snails. If all of the marked snails were still active in the woodland when the second group of snails were captured, what should the biologist estimate the snail population to be based on the probabilities suggested by this experiment? a. 630 b. 1,010 c. 1040 d. 1080.
Answered by Paul Betts. 





Counterclockwise 
20010914 

From Rolanda: When Descartes invented the coordinate system he decided to number them counterclockwise. Why? Answered by Chris Fisher. 





Is there an odd and even function? 
20010302 

From Saima: Is there a function that is both even and odd at the same time? In other words, is there a function that can pass the yaxis, xaxis, and origin symmetry test? Answered by Claude Tardif and Penny Nom. 





Notation 
19990903 

From Judy Gray: My name is Judy Gray. I guess the level on this would be about middle school, and I am an other!! I've been out of school for alot of years. I have a couple of questions, I guess.  What does an equal (=) with a slash through it mean? I put intersects, but I think I'm wrong.
 What is the symbol of a small n? Only the symbol is wider. Example: If A = {1.2} B = {2,3} then what is A (n) B? Can you make sense out of that?
 What is the equation of the yaxis?
Answered by Penny Nom. 





Yaxis 
19970529 

From Leah: I know that the proper name for the X axis is the abscissa, but, what is the proper name for the Y axis? Answered by Chris Fisher. 

