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anonymous
 5 years ago
eresa invested $1425.00 in a savings account at her local bank. the bank pays simple interest of 3.5% annually. how much money would she have in 4 years?
anonymous
 5 years ago
eresa invested $1425.00 in a savings account at her local bank. the bank pays simple interest of 3.5% annually. how much money would she have in 4 years?

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bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0differential equations?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0simple interest i guess

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0oh i dunno i never used that stuff

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0i think i can do it another way

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0okay workin on it, afk

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0let me find a similar problem, i was solving these a couple of weeks ago, will get back to u asap

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0can u check the answer or do u have the answer?

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0So here I am going to use the following differential equation: dN/dt  k*N = 0

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0Where N is the amount of money and k is the percent at which it grows. You also know that she invested $1425.00 at some point, so let's call that point the beginning, or time is 0 t = 0

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0k is given to be 3.5%; so this is what you know: N(0) = 1425.00 (initial value  initial investment is $1425) dN/dt  3.5N = 0

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0Move 3.5N to the right: dN/dt = 3.5N Multiply both sides by dt: dN = 3.5N*dt Divide both sides by N: dN/n = 3.5dt

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0Integrate both sides: \[\int\limits_{}^{}dN/N = \int\limits_{}^{}3.5dt\]

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0on the left side you get: lnN + C1= 3.5t + C2, where C1 and C2 are arbitrary constants.

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0LnN = 3.5t + C2  C1 (some constant minus another constant is still a constant so ima replace the diff by C3)

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0LnN = 3.5t + C3. Now I have to get rid of Ln, so we raise e to the both sides of equation: \[e^{Ln \left N \right} = e^{3.5t+C _{3}}\]

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0are you following me?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i dont think its that complicated. i am in 6th grade

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0okay im sure its not that complicated

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0oh well do u want me to finish it? at least get the answer? I think there def is an easier way using logic or smth, but i have no idea how to solve it that way lol. im in college now

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0:) thanks for your help. you could try

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0wait i think i messed up somewehere in between

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0im gettin a ridiculous number

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0thats ok...i think it would be: Amount= 1425*(3.5/100)*4

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0oh crap im using the wrong method. Mine is for changing amount of money, urs is the ez way, they'r assuming that the APR won't change. Like I mean 3.5% of 1425 is not the same as 3.5 of 20k. That's what im solving for, in ur case the 3.5% stays the same.

bahrom7893
 5 years ago
Best ResponseYou've already chosen the best response.0which means my solution is totally wrong for this problem lol sorry off to help others, but i really cant do this any other way
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