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.
The Mali Empire (Manding: Nyeni[5] or Niani; also historically referred to as the Manden Kurufaba,[1] sometimes shortened to Manden) was an empire in West Africa from c. 1230 to 1670. The empire was founded by Sundiata Keita and became renowned for the wealth of its rulers, especially Musa Keita.