Restating the conditions of problem 1, the cost to buy t-shirts is $5.00 for the first 10 shirts, $4.00 for each additional shirt up to 50, and $3.00 for each shirt above 50. if you purchase 100 shirts, what is the average cost per shirt?

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