Mr. conner is placing stone tiles to make a patio. each tile is 1 square foot. the drawing shows the dimensions of his patio.

how many total stone tiles will mr. connor need for the patio?

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