Function Model Selection and Assumption Articulation Practice Test

A lake’s fish population $P(t)$ (thousands) satisfies $P(0)=18$, $P(4)=26$, and levels near 40 due to resources. Which function model best fits the given data?​

A chemical concentration $C(t)$ (mol/L) is recorded as $C(1)=0.30$, $C(3)=0.55$, $C(8)=0.69$, and is expected to plateau below 0.75. Which function model best fits the given data?