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Please can somebody help me with this technical (probably simple) issue. The question is asking for the learning rate and it has given us the time to make the 1st and the time to make the first 8 units, so it’s by using doubling. I feel i understand concept….
Looking at the answer:
…using algebra: 34.3 = 8 x (12.5 x r3) (r cubed)
4.2875 = (12.5 x r3) (r cubed)
0.343 = r3 (cubed)
r = 0.70Please can anyone tell me how using calculator one gets 0.70.
In previous eg’s if it was 0.343 = r to the power of 4 then I would get the square root of 0.343 and it would give the correct answer. I don’t remember this being explained in lectures but I may stand corrected!?Any help much appreciated
Billy
When you ask in this forum then ‘somebody’ will always be me, because I am the tutor for Paper F5 🙂
To take the third root, you need a scientific calculator – that will have a button on it for taking n’th roots (and probably specifically for taking cube roots as well). You must have a scientific calculator anyway for other calculations (such as using the formula for learning curve calculations when it isn’t doubling).
I don’t give calculator lessons in the lectures, because different calculators have different buttons 🙂
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