How do you solve this question? (Please help! I can't find any tutorials on this)

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

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.

Which of the binomials below is a factor of this exression? 16x^2+40xy+25y^2 a.4x-5y b. 2x-5y c.4x+5y d.2x+5y