Jake is trying to mail a package to his grandmother. he already has s stamps on the package. the postal worker tells him that he is going to have to double the number of stamps on the package and then add 3 more. write an algebraic expression that represents the number of stamps that jake will have to put on the package.

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