Answer:
Option A - $ 40.00 - $9.50 - $4.25 - $5.00
Step-by-step explanation:
Given : Tu went to the movies. he bought 2 tickets for $ 9.50 each, popcorn for $ 5.00, and 2 drinks for $ 4.25 each. He give the clerk two $ 20.00 bills.
To find : Which expression can not be used to find the amount of changes Tu got?
Solution :
He give the clerk two $ 20.00 bills i.e.
or 40
He bought 2 tickets for $ 9.50 each i.e.
or -9.50-9.50
Popcorn for $ 5.00 i.e. 
2 drinks for $ 4.25 each i.e.
or -4.35-4.25
The expression can not be used to find the amount of changes Tu got is
' $ 40.00 - $9.50 - $4.25 - $5.00'.
Therefore, option A is correct.
6 Square root of 5? Are you sure you didn't type that incorrectly?
Let's list the factors of 70
1,2,5,7,10,14,35,70.
So 1 and 70 doesn't work since the perimeter is 142. 2 and 35 don't work since it adds up to 74. 5 and 14 work though since the perimeter would equal 38.
So the length and width would be 5 and 14 :D
Those are digits, also known as numbers. There are lot's of other names as well, like real numbers, integers, and so on.