Original post by goodwinning
4.1 t=3 so . Calculate that.
4.2 v=200 so . Solve that.
Original post by BuryMathsTutor
4.1 t=3 so . Calculate that.
4.2 v=200 so . Solve that.
4.2 v=200 so . Solve that.
Right, I'm alright for 4.1 now but I'm stuck on how to solve for t on the second one.
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Original post by goodwinning
Right, I'm alright for 4.1 now but I'm stuck on how to solve for t on the second one.
Ok so I've got 200/230 = 1-e^-0.1t so far, now I have to take the ln right?
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Original post by goodwinning
Yes use natural logs on both sides
Original post by Muttley79
You shouldn't take natural logs until the equation has e ^ power as a subject
Yeah I figured as I was doing it. So I've now got e^-0.1t = -200/230 +1 and I suppose now I can take natural logs of both sides. Correct?
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Original post by Muttley79
How will you deal with the negative power?
Once I've take natural log of both sides, I'll then multiply both sides by negative 1.
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(edited 9 years ago)
Original post by goodwinning
Once I've take natural log of both sides, I'll end up with -0.1t=ln-200/230 + 1 and il divide both sides by -0.1
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