A company that sells pens knoews that the numvers of says those pens last when used in an office is normally distirubted witha standard deviation of 5 days. how many pens do they need to sample if they want to create a 95% confidence interval of the average nubmer of days with an error of /- 2

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