
1) Substitution from definition.
2) We use 
3) We are changing the order of 3 and
.
4) We add 1 and 3
and we get 
5) Substitution from definition (but the other way than at the beginning).
Answer:
On a Sunday?
Step-by-step explanation:
Answer:
5
Step-by-step explanation:
When you go to stores and it advertises 25% off or something like that is a big one. tipping 15% or 20% is another application. a third would maybe be the interest you earn on a bank account??