Which expression represents the phrase "twice the sum of a number and three"?

Mario was conducting research regarding the treatment of aids victims using stem cells. he found a source that was written recently and the author was known. unfortunately, he could not determine if it had been peer reviewed.

In the 2010 ncaa men's lacrosse annual meeting, a rule change regarding "get it in/keep it in" was added to what section?

Write an essay describing and predicting the effects of fitness-related stress management techniques on the body. should be at least 3 paragraphs