Question

11. If (x - a)(x - b) < 0, then
A. x < a
B. x < b
C. x < a and x < b
D. x < a or x < b
E. x = a and x = b

12. If a < 0 and b < 0, then
A. (a + b)^2>0
B. (a + b)^2>=0
C. (a + b)^2<0
D. (a - b)^2<0
E. (a + b)^3>0