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Maths p42 question

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Guys,
For the gradient of the graph, what did u get??

Also,
What do u think the grade thresholds will be??
 
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Guys,
For the gradient of the graph, what did u get??

Also,
What do u think the grade thresholds will be??
if u see justpastpapers.com, they wrote -12. I got -12 too during the test. I actually differentiated the equation to make sure my gradient was correct.
 
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yeah when my teacher did it, he got -8.6. I got -9.1. I think the boundary will be -8.5 to -12
 
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