According to this article, what is the difference between speech and language?

It is possible to have language without speech. It's likely you have heard about sign language, perhaps you even know sign language. Sign language has its own set of symbols and rules, just like written and spoken language. Regardless of the form of language you use, the purpose is to communicate. Effective communication is the first and primary goal.

is the answer for Edgen.

i don't see any right answer. i don't know english and only math