During one semester of school, Sara Baker spent $4000 on expenses. She spent $800 of that $4000, or 20%, on rent. On a pie chart of Sara's expenses, how many degrees must represent rent?

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