Nora took 8 bottles of water to a picnic. Of those bottles of water, she and her friends opened a certain number of bottles. b. What expression can be used to determine the number of unopened bottles at the end of the picnic?

A. 8+b

B. B+8

C. 8-b

D. b-8

Problem

Nora took 8 bottles of water to a picnic. Of those bottles of water, she and her friends opened a certain number of bottles. What expression can be used to determine the number of unopened bottles at the end of the picnic?

Result

C. 8 - b

Solution

I strongly recommend that you try to find the reason why the answer is the way it is.