Add the complex numbers: (4 + 8i) + (-2 - 1)
A) 6 +9i
B) 6 + 7i
C) 2 + 7i
D) 2 + 9i

Which is a logical conclusion based on the given information? a. figure abcd is a rhombus by the definition of a rhombus. b. segment ac is congruent to segment dc by cpctc. c. angle acb is congruent to angle adc by the angle-side-angle theorem. d. triangle acd is congruent to triangle cab by the hypotenuse-leg theorem.