yes
That is an increase of 50%. 45 is half again as large as 30.
"Again" is an adverb, since it describes an action.
He had followed the diet carefully but now he was straying and his weight was beginning to increase again.
Repeatedly.
One after another or over and over again.
tell him/her nicely and ask him/her not to do it again.
If you visit somewhere you go there in person. Thus if you "visit repeatedly" you are going to the same place over and over again.
Yes it is. Many (but not all) words that end in -ly are adverbs. You can use repeatedly to modify a verb. For example, "He denied the accusation repeatedly."
Anew, repeated, repeatedly, over and over, newly...
To happen, come up, or show up again or repeatedly
You will need to ask your doctor. Every person is different and so there is not a yes or no answer.
again, again and again, frequently, many a time, many times, much, oft, often, oftentimes, ofttimes, regularly, time after time, time and again