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Working out gradient of ln graph

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Are you supposed to be using natural logs?
Reply 61
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A0W0N
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Original post by mqb2766
Are you supposed to be using natural logs?

it doesn't say but using base e doesn't give the right answer
Original post by A0W0N
it doesn't say but using base e doesn't give the right a

It does when you use the right numbers from the graph.
You seem to randomly change things.
Reply 63
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A0W0N
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9
Original post by mqb2766
It does when you use the right numbers from the graph.
You seem to randomly change things.

I got it now thanks
image.jpg
ii) i need to find n i know for k it is the vertical intercept and for n i thought it was tge gradient to the power of the base is that wrong?
image.jpg190.2KB
Original post by A0W0N
I got it now thanks
image.jpg
ii) i need to find n i know for k it is the vertical intercept and for n i thought it was tge gradient to the power of the base is that wrong?

Again, what is the model you get when you take logs?
That tells you what to what to "read off" the transformed linear graph.
Reply 65
Avatar for A0W0N
A0W0N
OP
9
Original post by mqb2766
It does when you use the right numbers from the graph.
You seem to randomly change things.

I got it now thanks
image.jpg
ii) i need to find n i know for k it is the vertical intercept and for n i thought it was tge gradient to the power of the base is that wrong?

Original post by mqb2766
Again, what is the model you get when you take logs?
That tells you what to what to "read off" the transformed linear graph.

base 10
Original post by A0W0N
I got it now thanks
image.jpg
ii) i need to find n i know for k it is the vertical intercept and for n i thought it was tge gradient to the power of the base is that wrong?


base 10


Again, if you take logs of the original model, what the terms mean on the graph should be obvious. What do you get when you take logs?
Reply 67
Avatar for A0W0N
A0W0N
OP
9
Original post by mqb2766
Again, if you take logs of the original model, what the terms mean on the graph should be obvious. What do you get when you take logs?

I know why i got it wrong i needed to use exact values, can someone please explain why I'm getting this answer for iii) when the answer is 2500m
image.jpg
i used the correct values for k and n and im using exact values now.
image.jpg180.8KB
image.jpg183.9KB
Original post by A0W0N
I know why i got it wrong i needed to use exact values, can someone please explain why I'm getting this answer for iii) when the answer is 2500m
image.jpg
i used the correct values for k and n and im using exact values now.

Look at the time units of the question and model.
(edited 3 years ago)

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