Homework 1 Math 688 Graduate Combinatorics I
Fall 2020
Due Friday, September 11
1. (2 points) Let I be a connected graph that contains exactly two vertices of odd degrees.
Prove that there exists a walk from one vertex of odd degree to the other vertex of odd
degree that goes through every edge exactly once.

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?

Me d is also an option but i couldn't get it in the picture