2 q's

a +  bi   is  ⇒    Complex

(6 + 5i)  ( 3 - 7i)  =

6 (3 - 7i)  +  5i (3 - 7i)  =

18 - 42i  + 15i   - 35i^2          (remember that i^2  = -1)....so we have

18 - 27i - 35 (-1)  =

18 - 27i + 35  =

53- 27i

#2 is D

#1 i believe is complex numbers