The discount was 25% off use 21/28 which is 75 percent of what it was before. 25 percent off.
I dont know the answer i pressed on the wrong topic im sorry
Answer:
-4 + 4
Step-by-step explanation:
because when you add a negative number with a positive number the sum will always equal 0
I am joyus to assist :)
Consider,

. Let's say

then the problem reduces to

. (Do you understand this step?)
So then replacing a again with our definition we get,

.