A survey estimated that a doctor's average salary is R$ 7,000.00. The margin of error is R$ ± 1500. This means that:

A) The average salary of physicians is between R$ 5,500 and R$ 8,500

B) The confidence interval is 95%

C) The margin of error is R$ 1500.00

D) Z* is equal to 1.96

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth