Tutors Answer Your Questions about Exponential-and-logarithmic-functions (FREE)
Question 42664: The concentration C = C(t) of chlorine in the tank t hours after flushing begins is given by C=0.1+2.78e to the -0.37t mpg.
-what is the initial concentration of chlorine in the tank?
-express the concentration of chlorine in the tank after 3 hours.
ps - i need to know how to work the problem specifically.
Thanks
Click here to see answer by fractalier(2101)   |
Question 43956: In a certain area, the sale price of new single-family homes has increased 4.1% per year since 1992. If a house was purchased in this area in 1992 for $75,000 and the growth continues, what will the sale price be in 2006? Use y=a(1+r)^t and round to the nearest cent.
Thanks
Click here to see answer by adamchapman(301) |
Question 43956: In a certain area, the sale price of new single-family homes has increased 4.1% per year since 1992. If a house was purchased in this area in 1992 for $75,000 and the growth continues, what will the sale price be in 2006? Use y=a(1+r)^t and round to the nearest cent.
Thanks
Click here to see answer by fractalier(2101) |
Question 44663: For the function defined by f(x)= 2-x^2, 0 less or equal than x, use a sketch to help find a formula for f^-1(x). My answer is f^-2(x)= squrt2-x, x less or equal than 2. This I'm not sure of. Thanks as always for looking at my post.
Click here to see answer by stanbon(57412) |
Question 44728: If piece of real estate purchased for $75.000 in 1998 appreciates at the rate of 6% per year, then it's value t years after the purchase will be f(x)= 75.000(1.06^t). According to this model, by how much will the value of this piece of property increase between the years 2005 and 2008. My answer is 21,500 is that right. thanks for checking.
Click here to see answer by adamchapman(301) |
Question 44662: For the function defined by f(x)=5x-4, find a formula for f^-1(x). This one I tried many ways of finding an answer. My answer is f^-1(x)= 1 divided by 5x-4 but not sure if thats right. Thanks for checking my answer.
Click here to see answer by OHtutor(16) |
Question 44662: For the function defined by f(x)=5x-4, find a formula for f^-1(x). This one I tried many ways of finding an answer. My answer is f^-1(x)= 1 divided by 5x-4 but not sure if thats right. Thanks for checking my answer.
Click here to see answer by Nate(3500) |
Question 44934: The decibel level of sound by D=10 log(I/10^-12), where I is the sound intensity measured in watts per square meter. Find the decible level of a whisper at an intensity of 5.4 times 10^-10 watts per square meter.
After working at this one for some time I came up with 37.3 is this right. thanks for checking my answer.
Click here to see answer by Nate(3500) |
Question 44933: The amount A in account after t years from an initial principle P invested at an annual rate r compounded continuously is given by A = Pe^rt where r is expressed as a decimal. Solve this formula for t in terms of A,P and r.
My answer would be t=1n{AP/r} is this right. Thanks soooo much for looking at this question.
Click here to see answer by Nate(3500) |
Question 44930: The amount A in account after t years of an initial principle P invested at an annual rate r compounded continuiusly is given by A = Pe^rt where r is expressed as a decimal. What is the amount in the account if $500 is invested for 10 years at the rate of 5% compounded continuously? My answer is $750.00, thanks for checking my answer.
Click here to see answer by venugopalramana(3286) |
Question 44930: The amount A in account after t years of an initial principle P invested at an annual rate r compounded continuiusly is given by A = Pe^rt where r is expressed as a decimal. What is the amount in the account if $500 is invested for 10 years at the rate of 5% compounded continuously? My answer is $750.00, thanks for checking my answer.
Click here to see answer by Nate(3500) |
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