What is
factorise:
4x squared -1
9x squared -64
49x squared -121
4x squared -y squared
9a squared -b squared
16a squared -9b squared
x squared -42 squared

me asap

There is a theorem :

Proof: open the brackets on right side of equality by using distributive property

RHS = a(a+b) - b(a+b)

RHS =

RHS = = LHS

Using the above theorem you can solve every question you asked:

from the sentence, "tomorrow morning, akiko will arrive an hour late" depicts a third person perspective because it doesn't use any pronoun to replace akiko, the subject of the sentence, and it is in singular form since akiko is only one person.