Hello,I'm pleased to answer your question,let me show my opinion. For the first question I think your opinion is correct.When this question appears in a multiple choice test,both answers will be ok.There is a little bit difference between them.When you use "analyzed", I think the event has taken place before this very import.You can use both of then to create your sentence,but the meaning of
You are right. Using either "analyzes" or "analyzed" is correct in the present context.
Answer 2.
You should say "... Mr Tanaka is a teacher." Although you said this three weeks ago, the fact is Mr. Tanaka is still a teacher. So, using "is" is correct. This is similar to saying, "Scientists found that the earth is round."