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smurfy14
 5 years ago
lnx=2.046 help??
smurfy14
 5 years ago
lnx=2.046 help??

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0If you are trying to solve for x you need to isolate x. To do this here we need to get rid of the ln on the left side...how can we do this?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Only problem with division here is that ln is a defined function itself, so dividing it does no good.

smurfy14
 5 years ago
Best ResponseYou've already chosen the best response.0so instead you would do e^2.046 right??

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yes :) You would take e to the power of both sides get what you said on the right, and since e is the inverse of ln, they cancel and form 1.

smurfy14
 5 years ago
Best ResponseYou've already chosen the best response.0oh ok cool :) thanks! do you think you could help me with one more?

smurfy14
 5 years ago
Best ResponseYou've already chosen the best response.0The temp of an ingot upon being immersed in water kept at 20 degrees Celcius is 20+670e^5t after t minutes. How long will it take for the temp to reach 25 degrees celcius?

smurfy14
 5 years ago
Best ResponseYou've already chosen the best response.0for starters, do you know what formula i need to use?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0The formula is given. 20+670e^(5t)=desired temp.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0So you need to do the same thing. Isolate t since that is what it is asking for.

smurfy14
 5 years ago
Best ResponseYou've already chosen the best response.0so first i subtract 20 right?

smurfy14
 5 years ago
Best ResponseYou've already chosen the best response.0so the next steps would be: ln670+lne^(57)=ln5 and then would you move the 5t in front of the lne?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0You want to take 5 and divide by 670. This will leave you with e^(5t)=5/670 From here you can do the opposite of last time, which you got right, take the ln of both sides leaving 5t=ln(5/670)

smurfy14
 5 years ago
Best ResponseYou've already chosen the best response.0oh ok! so i would get 0.992 as the final answer correct?

smurfy14
 5 years ago
Best ResponseYou've already chosen the best response.0um i dont think i did the last step correctly?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I got about .980 seconds...remember time will never be negative and you can always plug your answer back in to see if it comes out right.

smurfy14
 5 years ago
Best ResponseYou've already chosen the best response.0ok ok i see what i did wrong thanks! :)
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