Number 4 is F
Number 5 is B
Option D:
is the product of the expression
Explanation:
The expression is 
We need to determine the product of the expression.
To determine the product of the expression, we need to simplify the given expression.
Thus, we have,

The term
is of the form 
Now, we shall use the identity,
Hence, we have,

Multiplying the terms and cancelling the common terms, we get,

Hence, the product of the given expression is 
Therefore, Option D is the correct answer.
All you have to do is multiply 84 by 25%
And that's your answer.
I hope this helped
It has multiple functions but it should be close to the middle
Yes 1.999 is an <span>irrational number</span>