The number of research articles in Physical Review that were written by researchers in the United States from 1983 through 2003 can be approximated byA(t) = -0.01t² + 0.24t+ 3.4 hundred articles(t is the time in years since 1983).(a) Find an appropriate domain of A. (Enter your answer using interval notation.)Is t ? 20 an appropriate domain?YesNo(b) Compute A(16).hundred articles.What does the answer say about the number of research articles?Since t= 16 represents, the answer tells us that, in , approximately x 100 = T research articles in Physics Review were written by researchers in the U.S.