### Home > PC > Chapter 7 > Lesson 7.1.1 > Problem 7-11

7-11.

Brittany and Kylie were trying to decide where the graph of , but Kylie said that it could not be concave up for

*since the function was decreasing. Brittany said that it did not matter; all that mattered was that it curved up. Which of the two was right? Explain your answer.*

Brittany; segments connecting any two points on the graph are above the graph.