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    clueless123's Avatar
    clueless123 Posts: 6, Reputation: 1
    New Member
    		  
    #1

    Jun 21, 2008, 12:07 AM
    Finding the rule
    Hi there I am asked this question

    " A boy's height between the ages of 10 and 15 increases according to the rule: h=Aloge(kx) where h is his height in metres at age x.
    If he was 1 m tall at age 10 and 1.6 m tall at age 15, find the values of A and k correct to 3 decimal places.

    I know I have two points already but I don't know how to define them. Are the two points (0,1) and (6,1.6)

    Thanks
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #2

    Jun 21, 2008, 02:42 AM
    Just substitute the values you have that is 1m and 10yrs, and 1.6m and 15 yrs, in yr equation to have the two points. I think you have it.

    You'll then have two equations from yr substitutions and solve them simultaneously. You'll have the value of A and k. Insert them in your first equation, i.e. h=Aloge(kx).
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