can anyone help me with solving problems with Exponential and Logarithmic

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- anonymous

can anyone help me with solving problems with Exponential and Logarithmic

- chestercat

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- anonymous

Yes where are the questions

- amistre64

yes

- anonymous

Solve this equation for x. Round your answer to the nearest hundredth.
0.59 = log x

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## More answers

- amistre64

assuming log is base 10

- amistre64

10^.59 = x

- anonymous

i got 3.890

- amistre64

that is correct... or so the calculator tells me :)

- anonymous

6 = In(x+4)

- amistre64

e^6 = x+4
e^6 -4 = x

- anonymous

399.427?

- amistre64

thats correct

- anonymous

now.. here is a type i'm stuck on

- anonymous

You invest $4200 in an account that pays an interest rate of 6.5%, compounded continuously.
Calculate the balance of your account in 10 years. round your answer to the nearest hundredth

- amistre64

to compound continuosly means we use pert for our answer..
4200(e^(.065)(10))

- anonymous

80452.680?

- amistre64

8045.271 is what i get... but i have no 'e' button

- anonymous

e generally equal 2.71828

- amistre64

2.71828182845905.... :)

- amistre64

4200(e^.65)

- anonymous

for that i got 8045.268

- amistre64

you got a choice of answers to go from?

- anonymous

no. i have to type in an answer

- amistre64

does the material you are working from give you an approximation for 'e' to use?

- anonymous

no but i searched it & was also told that almost every time e = 2.71828

- amistre64

4200 * (e^.65) = 8045.27148 when i type it into google, the calc pops this out...

- amistre64

id go with:
8045.27 or .28

- anonymous

i went with .27

- anonymous

nextt question:
holly wants to save money for an emergency. holly invests $1200 in an account that pays an interest rate of 4%.
how many years will it take for the account to reach $15,400? round your answer to the nearest hundredth

- shadowfiend

Remember to give amistre a medal if they helped you out!

- anonymous

was already planning on doing that

- anonymous

4% interest is SIMPLE INTEREST or COMPOUND INTEREST???

- anonymous

i really don't know. it doesn't say. some have said compounded continuously. but this one doesn't

- amistre64

they can also forget to give me a medal.... i got plenty to spare ;)

- amistre64

if its over a year, then compund interest is applied usually

- anonymous

Using Simple Interest, the time comes out way too long, must be Compound interest

- amistre64

savings accounts are usualy compounded yearly...

- anonymous

i do believe it is compounded

- anonymous

Pls check and reconfirm the numbers in the question. The given ones don't seem to b right

- anonymous

those are correct

- anonymous

The given numbers do not work for Compound interest
So, for Simple interest, the answer is 295.83 years (Way too long!!??)
This one beats me:(
Anyone else take a shot at it??

- anonymous

i'll post the question again as another question & see if anyone will answer it. i'm confused on these ones.

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