In an experiment, a petri dish with a colony of bacteria is exposed to cold temperatures and then warmed again.

time (hours) 0 1 2 3 4 5 6
population (1000s) 5.1 3.03 1.72 1.17 1.38 2.35 4.08

a. find a quadratic model for the data in the table. type your answer below.

b. use the model to estimate the population of bacteria at 9 hours. type your answer below.

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.