A package of gum that contains 15 pieces advertises 135 calories per package. Which unit rate can be used to describe this package of gum? 9 calories per piece
9 calories per package
9 pieces per calorie
9 pieces per package

This is different from the first one can someone me

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.

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.