D I
Alex jogged round a 400-m track. He took a total of 16 min to jog 3 rounds of
the same track.
(a)
(b)
Find the total distance that Alex had jogged.
Find Alex's average speed in m/min.
19​

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