18. simplify this expression: 13+ (-) = ?
o a.-6
o b.–30
o c.6
o d.30

What is the standard form of -5x^2+2x^4-11+x^3+3x

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.

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?