Hello, can anyone help me understand these 3 questions? http://imgur.com/r9rj4mh Sorry I couldn't post it here but my school doesn't allow me to copy and paste. I just don't understand math at all. (Please don't give me the answers)

Question

Hello, can anyone help me understand these 3 questions? http://imgur.com/r9rj4mh           Sorry I couldn't post it here but my school doesn't allow me to copy and paste. I just don't understand math at all. (Please don't give me the answers)

anonymous · Answer

ok first of all you need to know the difference between numerical and variable expressions..
Numerical expressions involve numbers associated with the help of some algebraic operation (+,-,*,/...) e.g.  5+3, 3/3 etc

While variable expressions involve variables (denoted by alphabets usually)...a variable can take any numerical value...e.g  x+3 (here x is a variable) (x can be any number)

anonymous · Answer

Thanks for the info! Is there anything else I should know?

anonymous · Answer

so do you understand these questions in attachment?

anonymous · Answer

Yes

anonymous · Answer

Great

anonymous · Answer

and Welcome to OS :)

anonymous · Answer

Thanks, and thanks for the help! :)