Math
posted by Help
Which situation can be represented by the expression x plus negative 3? Choose all that apply.
A.An elevator went down 3 floors.
B.A person spent $3.
C.A person added 3 books to the shelf.
D.The temperature dropped 3 degrees.
My Answers are B and C

Help
Is it right? If not Please explain....

Ms. Sue
One of your answers shows subtraction; the other shows addition. How can that be?

Help
Ms.Sue
I know C shows addition. I wasn't really sure about A,B or D cause they all show subtraction. 
Ms. Sue
Yes, that's right. A, B, and D are correct.

Help
I am confused. Aren't you supposed to do addition. I thought you do subtraction when you are trying to find the sum.

Ms. Sue
A negative and a positive is a negative.
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