Which pair of complex numbers has a real-number product? (1 + 21)(81)
(1 + 21)(2-51)
(1 + 21)(1 – 21)
(1 + 21)(41)

answer: 2 and 1

step-by-step explanation: got this question

idk

step-by-step explanation:

use that smart brain

idk

step-by-step explanation:

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.