Problems adapted from questions set for previous Mathematics exams.
The following diagram shows a distance-time graph of the movement of a fish.
(a) Work out the average speed between 10 and 20 seconds.
(b) Estimate the speed of the fish at 25 seconds.
The graph shows the temperature (\(T\)) of an unidentified flying object over a period of 10 seconds (\(t\)).
Use the graph to work out an estimate of the rate of decrease of temperature at 7 seconds. You must show your working.
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