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# Instantaneous rates of change watch

1. I found this question online too and it said the answer was 300 but with no working? Any suggestions?
2. One way to do this will be to draw a straight line (with a ruler) between the two ends of the printed curve. Then slide the ruler up and down the page, keeping it as closely parallel as possible to the line you drew, until the ruler just touches the curve at a single point (i.e. is a tangent to the curve at that point). Now hold the ruler still and draw in the tangent line. Finally read off the value of t where the tangent line just touches the curve. You might not get exactly 300, but bear in mind the question asks for an estimate not an exact value.
3. Can I see the entire question? Like need the part above (a)
4. (Original post by old_engineer)
One way to do this will be to draw a straight line (with a ruler) between the two ends of the printed curve. Then slide the ruler up and down the page, keeping it as closely parallel as possible to the line you drew, until the ruler just touches the curve at a single point (i.e. is a tangent to the curve at that point). Now hold the ruler still and draw in the tangent line. Finally read off the value of t where the tangent line just touches the curve. You might not get exactly 300, but bear in mind the question asks for an estimate not an exact value.
Thanks so much
5. (Original post by UziGun)
Can I see the entire question? Like need the part above (a)
That is it

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