For regions where f ''(x) is positive, the function is concave up; where f ''(x) is negative the function is concave down. So, looking at the graph of f '(x), wherever slope is positive, you've got a positive second derivative and the function is concave up.
U-Meleni was a part of a group of Artists conducting workshops on spoken word and creative writing showing how it can be used to empower and create change. U-Meleni then travelled to ZIMBABWE for three weeks ( Aug 13-Sept 2, 2006) to spend time with family and friends.
Melena is a term that describes a particular appearance of blood in stools. This term describes stools that are black, tarry and often foul-smelling because of the presence of blood from the upper gastrointestinal tract.esting the stools is important because in certain specific situations, stools can take on the appearance of melena even if no bleeding is present. For example, eating black licorice, eating blueberries or taking iron pills can cause stools to have a similar appearance.