A game uses 8 letters: A, B, C, D, E, F, G, H. How many possible outcomes can you have if you choose 3 letters at a time? Show your calculations.

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