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Tutors Answer Your Questions about Exponential-and-logarithmic-functions (FREE)
Question 54615: Please help w/ the following: Thank you
The amount of money A accured at the end of N years when a certain amount P is invested at a compound annual rate r is given by A=P(1+r)^n. If a person invests $160 at 4% interest compounded annually, find the approximate amount obtained at the end of 15 years.
Click here to see answer by checkley71(8405)   |
Question 54614: Please help w/ the following. Thank You.
If 10,000 is invested at 9% compounded monthly for 6 years the compounded amount is given by A=10,000(1.0075)^72. Given that log 1.0075=0.00325, find log A. (Note that 10,000=10^4).
Click here to see answer by stanbon(26259) |
Question 54764: Yesterday I submitted this problem;however,forgot to include e.
Please help.Thank You
the number of bacteria present in a culture after t minutes as B=100e^kt If there are 6231 bacteria present after 11 minutes, find k.
Click here to see answer by funmath(2873) |
Question 55177: PLEASE HELP ME:
The amount of a radioactive tracer remaining after t days is given by A=Ao e^-0.18t where Ao is the starting amount at the beginning of the time period. How much should be acquired now to have 40 grams remaining after 3 days?
Click here to see answer by funmath(2873) |
Question 55172: PLEASE HELP ME WITH THIS PROBLEM:
The population P of a certain culture is expected to be given by a model P=100e^rt where r is a constant to be determined and t is a number of days since the original population of 100 was established. Find the value of r if the population is expected to reach 200 in 3 days.
Click here to see answer by funmath(2873) |
Question 55568: find the inverse of the following function; f(x)= 10^(x-3)+4
determine the value of log with a base of n times ab squared so like lognab squared, with the n as a base of log; if log base na (logna)=5 and lognb=3
Click here to see answer by stanbon(26259) |
Question 58012: Kindly assist me with the following calculus problems :
Q1
calculation mad easy ltd , wishes to estblish its profit function . however the cost and revenue functions are not readily available and therefore need to be established first . the following data complied from past records for this purpose
units (x) 50 100 150 250 300
cost C(x) usd (000) 4250 5100 5950 7650 8500
revenue ( R) usd ( 000 ) 1700 3400 5100 8500 10200
a) determine the cost , revenue an profit function
b) find the break even piont
c) what is the ecpected profit when 400 units are produced and sold ?
Q2
market survey of suppliers of a particular product have resulted in the conclusion that the supply is approximately quadratic . suppliers were asked what quantities they would be willing to supply at different market prices .
the results of the survey are below
price ( usd) 25 30 40
supply (000) units 112.5 250 600
further survey of the demand pattern of the product indicated that the demand function was D(p)=p^2-100p-2500
a) determine the supply function
b) determine the market equilibrium price and quantity
Click here to see answer by stanbon(26259) |
Question 58309: Exponential Functions
It is known that fourth of all aluminum cans distributed will be recycled each year. A company distributes 1,9000 cans.
The number of cans still in use after time t, in years, is given by the following function.
N(t)=1900(1/4)^t
How many cans are still in use after 5 years?
This is not from a text book, I am taking an on-line class.
I have tried this several times and can not seem to figure it out.
Click here to see answer by funmath(2873) |
Question 58662: Hello,
I know you are stressed for time so I do not need an writeup on this question, just the break down in numbers,
could you please help me find x in the equation log(x+6)=log(x+1)+0.699
best regards,
Len
Click here to see answer by stanbon(26259) |
Question 59163: Hello, could you help me with writing a function, all I need is the function to understand it, I dont need an explanation.
A radioactive isotope is produced, it takes 20 minutes to double the existing amount of the isotope. write an equation for the number of isotopes, n, as a function of time.
thanks.
Click here to see answer by stanbon(26259) |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340
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