Abiologist studied the populations of common guppies and endler's guppies over a 6-year period. the biologist modeled the populations, in tens of thousands, with the following polynomials where x is time, in years. common guppies: 3.2x^2+5x+0.2 endler's guppies: 4.2x^2-5.1x+1 what polynomial models the total number of common and endler's guppies