DETAILS TANAPCALC 10 4.2.099. Growth in Clark County A certain county in Nevada is one unty from 1970 through 2010 is approximated by the function P(t)=41,757t³ -83,394t² +234,633t+273,288,(0<=t<=4) t is measured in decades, with t=0 corresponding to the beginning of Vas the population of the county always increasing or decreasing over t increasing decreasing