were the pics visible to u CPhill!

And me too CPhill!your answer is really good!it wil help me remember the property!Thumbs up from me!

Your welcome Mari!

Mari your answer is the third option " The late fee per day for the book " because 0.25x represents the late fee charged on Ruth for each day the book was overdue!in 0.25x , 0.25 represents the amount charged per day and x represents the number of days the book was late to be returned!

Hope uve understood by now but if not then pls be free to ask!

DragonSlayer the second term represents 0.25x because its the second term of the expression!

The answer is the second option 2.50 because if we multiply 2.50 or 2.5 by 12 to get the amount of 12 popcorns then it gives us 30 which when subtracted from 40 leaves 10 , so your answer is 2.50 !

Hope uve understood by now but if not then pls be free to ask!

Thanks DragonSlayer!

sorry once again for posting twice by mistake!wont repeat it(ill try my best)!

oh okay!i was just wondering!

This is an example of Associative Property of Addition ( the second option) because in this property the rule is 

a+(b+c)=(a+b)+c

So this

2 + (x + y) = (2 + x) + y 

is matching to the property!Thats is why the answer is the second option!