You mean by subtraction, right?
The answer is you need to post a pic in order to give help
Answer:
Opposite exterior angle
Step-by-step explanation:
Answer: 16 seconds
To decrease it by 20% percent,
We need to first find amount by:
=20*100/20
=4
Therefore 20% of 20 second is 4 seconds
Now let’s decrease it:
20-4
16
Therefore we get 16 second by decreasing 20% of 20 seconds