Which choice is equivalent to the expression below?
ì- 20
a. -20i
b. 2i ì5
c. -2 ì5
d. 2 ì5i
e. 20i

It seems you tried to write √(-20)

use the fact tha -1 = i^2

Then, √(-20) = √(20i^2) =(√20) i = (√(5*4))i = 2√5 i = 2i√5, which seems to be what you tried to write in the option B.

Divide 40%5 and your answer is 8