Answers

  • Brainly User
2015-09-30T12:43:52+08:00

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
I can think of it this way, without changing the sign of 1, and the operation (subtraction).

Subtract the opposite of the absolute value of 1 from 19.
Opposite of the absolute value of 1 = - I 1 I

Equation:
19 - (- I 1 I) = 20
19 - (- 1) = 20
19 + 1 = 20  (When subtracting integers, change the sign of the 
                    subtrahend, then proceed to addition rule.)
20 = 20


0