Which of the following sets does not contain any irrational numbers?
{-5.12,pi,30}
{square root of 80, 100, 6.56}
{ 9/2 , square root of 100, 5.123}
{5.123..., 1/2 , -65}

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.