Josh created a pattern by using tiles. 20 tiles were blue. the rest of the pattern used equal numbers of red & white tiles. 40% of the tiles were blue. how many red tiles were used?

Iam so stuck. what is the worked out answer for this 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.

Write the expression 7x^3-28xy^2 as the product of 3 factors