Which of the following is TRUE?
A. P is convex & Q is convex
B. P is convex & Q is concave
C. P is concave & Q is convex
D. P is concave & Q is concave
Answer:A
Which of the following is TRUE?
A. P is convex & Q is convex B. P is convex & Q is concave C. P is concave & Q is convex D. P is concave & Q is concave