The answer is choice A.
In this problem, we are shrinking the poster by 1/4 of its size.
Which means you need to divide the sides by 4
For width:

For length:
Answer: A
Explaination:
The cause and effect relationship of a certain phenomenon under controlled condition
Answer:
6, the property of addition.
Step-by-step explanation:
If you add 6 to both sides you used addition lol. Hope I helped, I'm not too good at explaining math sorry
No triangle 60+40=100 which is the same as one side