A Contagious And Fatal Virus Has Tragically Struck The City Of Plaguesville, Which Has Been Quarantined Until The Virus Has Run Its Course. The Function Pt)= 84 - 3* Gives The Number Of People Who Are Newly Infected Days After The Outbreak Began. (A) Find First And Second Derivatives P'(T) And P't). (B) Solve P(T)= 0,PU)= 0 And P"(T) = 0. Then Complete The