Question

How do you draw N,N-dimethylheptanamine?

The N,N part is confusing me most.

Answer 1

And how would you know something was a cyclic hydrocarbon when given something like CH3CH2COOH? (I know that one isn't a cyclic hydrocarbon but I mean like when you get questions saying "name the organic compound" and they give stuff like CH3CH2COOH and CH3CONH2, how do you know whether it's cyclic?)

Answer 2

The N,N means that EACH methyl group (it's dimethyl) is attached to the N of the amine. We can draw these things on this forum but I'll try my best here.
CH3
|
CH2
|
CH2
|
CH2
|
CH2
|
CH2
|
CH2
|
N-CH3
|
CH3