Jenny bought a 5 notebooks and 2 pencils, and the total was 9 dollars.
alex bought 3 notebooks and 2 pencils, and his total was 6 dollars. write an equation and solve to find how much does a notebook and a pencil cost.

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