Which system of equations can be used to find the roots of the equation 4x? - x3 + 2x? O
Sy=4x²
v=x²+2x
(y=x0+4x2+2x
l-o
Sy=4x²
Lu=-x²–2x
ly=4x²
[v=x²+2x
o

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.

I’m still confused on how to work the percentages

Which one is the correct answer, and why?