Which pair of complex factors results in a real numbeproduct? 15(–15i) 3i(1 – 3i) (8 + 20i)(–8 – 20i) (4 + 7i)(4 – 7i)

(4+7i)(4-7i).

This is because you FOIL it to get:

16 + 28i - 28i -49i^2.

That equals to 16 - 49i^2, which  equals to:

16 + 49

65, which is a real number.

D Is The Correct Answer

Step-by-step explanation:

(4+7i)(4-7i)

Your Welcome :)

to find the total number of combinations, multiply the quantity of each item by each other:

2 pairs of shoes x 3 pairs of shorts = 6 different combinations.

1.) 21

2.) 0.453

3.) 1.5

4.) 48

5.) $ 22

step-by-step explanation: