Asked by Anonymous
                You improve your time running a course by 5 seconds in a week by 3 seconds in week 2 and 4 seconds in week 3 what is the mean weekly change in your running time
            
            
        Answers
                    Answered by
            Anonymous
            
    [x+(x-5)+(x-8)+(x-12)] / 4
=
or
[x+(x-5)+(x-3)+(x-4)] / 4
    
=
or
[x+(x-5)+(x-3)+(x-4)] / 4
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