Batman is 4 times robins age the sum of their ages equals to 45 how old is batman and robin

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.

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Bring the fraction a/a-4 to a denominator of 16-a^2