Posted by Phoebe on Thursday, June 20, 2013 at 5:14pm.
20. Growth of an Account If Russ (see Exercise 19) chooses the plan with continuous compounding, how long will it take for his $60,000 to grow to $80,000?
3. (1/8) to the 2x-3= 16 to the x +1
13. e to the 4x= 4 to the x-2
15. ln (x-4) ln 3= ln(1/5) to the x power
20. Tripling Time For any amount of money invested at 6.8% annual interest compounded continuously, how long will it take to triple?
Please someone help ASAP!!!!!!!!! I don't understand any of these college algebra problems.
- College Algebra - Reiny, Thursday, June 20, 2013 at 5:45pm
you want to solve for t
60000 e^.0675t = 80000
e^.0675t = 1.333...
ln both sides and use rules of logs
.0675t lne = ln 1.3333... ( but lne = 1)
t = ln 1.3333../.0675 = 4.26 years, appr 4 years and 3 months
(1/8)^(2x-3) = 16^(x+1)
(2^-3)^(2x-3) = (2^4)^(x+1)
2^(-6x + 9 = 2^(4x + 4)
-6x + 9 = 4x + 4
-10x = -5
x = 1/2
e^(4x) = 4^(x-2)
ln both sides
4x lne = (x-2)ln4
4x = ln4 x - 2ln4
4x - ln4 x = -2ln4
x(4 - ln4) = -2ln4
x = -2ln4/(4-ln4)
= appr -1.0608
15. ln(x-4) ln3 = ln(1/5)^x
no simple algebraic way to solve this, unless I misread the question. I took it the way you typed it
ran it through Wolfram and Wolfram ran out of time trying to solve it
1 e^.068t = 3
now do it the same way as #19
Answer this Question
More Related Questions
- math - Assume you want to accumulate $125,000 for a long-range goal in 40 years...
- Algebra - A grandmother is looking for a plan to finance her new grandchild’s ...
- college algebra - A grandmother is looking for a plan to finance her new ...
- algebra - At what interest rate would a deposit of $45,000 grow to $110,682 in ...
- Math - Using continuous compounding. A 13,000 deposit in an account with APR of ...
- Algebra - If 10,000 is invested at 4.8% simple interest, how long will it take ...
- Calculous Pre - A population grows from 11,000 to 15,000 in three years. Enter ...
- Math - An initial deposit of $35,000 grows at an annual rate of 7% for 23 years...
- college math - Suppose you deposit $103,000 into an account paying 7.5% simple ...
- math - Suppose you start saving today for a $30,000 down payment that you plan ...