Nathaly is fixing up an apartment she just bought. She goes to Home Depot and spends $140.00 on plumbing and tiling supplies for the bathroom. Home Depot gives her a 10% discount because she is a frequent shopper. After getting the discount, Nathaly has to pay a 10% sales tax. What will be the total cost of Nathaly's plumbing and tiling supplies at the checkout?

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