Greg took his younger sister to the circus. He bought two tickets that each cost $23.50. He also bought popcorn that cost $6.50. Charlotte calculated that Greg spent $53.50 at the circus. Is Charlotte's calculation correct? How do you know?

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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