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September 22, 2014

September 22, 2014

Posted by **Britt** on Monday, November 19, 2012 at 1:27pm.

2).a contractor needs $80000.00 to finish one of the biuldings. He is able to borrow at 10% per year compounded quarterly. how much will interest amount to if he pays off the loan in 5 years?

the y0 should actually be y with a little 0 at the bottom right corner and as i said from the equation it is the amount of initial dose. Plus the initial dose is 200mg not 20 sorry. so how long would it take to get from 200mg to 50mg?

- Math prep -
**Reiny**, Monday, November 19, 2012 at 1:48pmAs I mentioned the last time you posted this question, what is the purpose of the comma after the y0?

You did not answer that question, so I will just ignore the comma.

y = y0 (.9)^^(t-1)

50 = 200 (.9)^(t-1)

.25 = (.9)^(t-1)

ln .25 = (t-1) ln.9

t-1 = ln.25/ln.9 = 13.16

t = 14.16 hrs

- Math prep -
**Reiny**, Monday, November 19, 2012 at 1:49pmI had answered the second part of your question before.

http://www.jiskha.com/display.cgi?id=1353294829

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