What are the quantities in this situation ? A rectangular garden is 12 2/3 ft long and has a perimeter of 40ft. How many feet should you add to the width of the garden to make its perimeter 47ft ?

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas 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