Aclass of 40 students elected a class president. there were 12 votes for candidate a, and 18 votes for candidate b. the remaining students in the class did not vote. which expression gives the percent of voters who voted for candidate a?

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