12,963 rounded to the nearest hundredth

Ineed to know the answer to this algebra question.

The american academy of pediatrics wants to conduct a survey of recently graduated family practitioners to assess why they did not choose pediatrics for their specialization. provide a definition of the population, suggest a sampling frame, and indicate the appropriate sampling unit.

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41