Please help me with question 4. I already did questions 1, 2 and 3. All information are below

1 . Do a 4 x 10 metres shuttle run to record the time taken for every 5 metres you run. You may wish to get 3 friends/classmates to assist you. ( 3 marks ) distance 2. Calculate your speed = distance/time and compile your records in a tabular form. time ( 2 marks ) 3. Obtain the best fit curve for the data that you have obtained by using Microsoft Excel. ( 5 marks ) 4. With the equation obtained, you can find the fastest speed of your 4 x 10 metres shuttle run by using the first or second derivative test. ( 5 marks ) I already did question 1, 2 and 3 + Time (seconds) Distance, x (Metres) Speed, y (Metres/Second) 1.21 5 4.13 1.96 10 5.10 2.23 15 6.72 2.97 20 6.73 3.78 25 6.61 4.57 30 6.56 5.98 35 5.85 6.87 40 5.82 speed, y (metres/second) Co y - -0.0062x2 + 0.3136x + 2.8214 ONWACO 10 15 20 25 30 35 40 45