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Tutors Answer Your Questions about logarithm (FREE)
Question 212012: How long will it take a sample of radioactive substance to decay half of its original amount, if it decays according to the function A(t) = 450e^-0.249t , where t is the time in years? Round to the nearest hundreth year.
choices (in years):
2.78
112.05
24.54
27.32
Click here to see answer by ankor@dixie-net.com(6691)   |
Question 212765: Use formula L=10*log I/Io, where the loudness of a sound in decibels is determined by I, the number of watts per square meter produced by the soundwave, and Io=10^-12 w/m^2. A certain noise produces 6.2 x 10^-4 w/m^2 of power. What is the decibel level of this noise?
Click here to see answer by Alan3354(6059)  |
Question 212873: Solve. Where appropriate, include approximations to the nearest thousandth. If no solution exists, state this.
ln (x - 5) + ln (x + 4) = ln 36
So I thought I remembered how to do these but I guess not. I tried to google some examples but still can't figure it out. Can someone help it would be greatly appreciated.
Click here to see answer by algebrapro18(206)  |
Question 212873: Solve. Where appropriate, include approximations to the nearest thousandth. If no solution exists, state this.
ln (x - 5) + ln (x + 4) = ln 36
So I thought I remembered how to do these but I guess not. I tried to google some examples but still can't figure it out. Can someone help it would be greatly appreciated.
Click here to see answer by jsmallt9(590) |
Question 212289: Evaluate the exponential equation for three positive values of x, three negative values of x, and at x=0
y= -3^-x
If I use -3, -2, -1, 0, 1, 2, 3. I'm confused as to the negative x shows that it automatically becomes 1. Is this correct?
-3^-(-3)
y= 9?
Click here to see answer by RAY100(1637) |
Question 214156: Could someone help me out with these two;
Give the logarithms of the following;
log(base 10)3.20
log(base10)second root (its like the the cube root just a 2 on place of the 3) 6
would be cool if someone could explain to me how to work those to out! ;)
Click here to see answer by Alan3354(6059) |
Question 215113: Hi, my name is Christy. Our professor passes out sheets in our class and I was wondering if you could help me with one of the questions.
It is the formula {A = P ( 1+R/N) nt Compounding Interest.
My question is An investment earns 5.6% interest, compounded monthly. Find the balance in the account after 3 years if $6000 is invested initially.
I had A = $6000 ( 1 + 0.056/365) (1) (3) Is this right? I am lost on how to get the correct answer. I know the formula, but cannot figure out how to get the correct answer. Thanks.
Click here to see answer by Alan3354(6059) |
Question 215113: Hi, my name is Christy. Our professor passes out sheets in our class and I was wondering if you could help me with one of the questions.
It is the formula {A = P ( 1+R/N) nt Compounding Interest.
My question is An investment earns 5.6% interest, compounded monthly. Find the balance in the account after 3 years if $6000 is invested initially.
I had A = $6000 ( 1 + 0.056/365) (1) (3) Is this right? I am lost on how to get the correct answer. I know the formula, but cannot figure out how to get the correct answer. Thanks.
Click here to see answer by jim_thompson5910(13787) |
Question 215485This question is from textbook College Mathematics II
: The loudness level of sound can be expressed by comparing the sound's intensity to the intensity of a sound barely audible tot he human ear. The formula D = 10(log I - log I0) describes the loudness level of a sound. D, in decibels, where I is the intensity of the sound, in watts per meter^2, and I0 is the intensity of a sound barely audible to the human ear.
(a.) Express the formula so that the expression in patentheses is written as a single logarithm.
(b.) Use the form of the formula from part (a) to answer this question: If a sound has an intensity 100 times the intensity of a softer sound, how much larger on the decibel scale is the loudness level of the more intense sound?This question is from textbook College Mathematics II
Click here to see answer by stanbon(26259) |
Question 215485This question is from textbook College Mathematics II
: The loudness level of sound can be expressed by comparing the sound's intensity to the intensity of a sound barely audible tot he human ear. The formula D = 10(log I - log I0) describes the loudness level of a sound. D, in decibels, where I is the intensity of the sound, in watts per meter^2, and I0 is the intensity of a sound barely audible to the human ear.
(a.) Express the formula so that the expression in patentheses is written as a single logarithm.
(b.) Use the form of the formula from part (a) to answer this question: If a sound has an intensity 100 times the intensity of a softer sound, how much larger on the decibel scale is the loudness level of the more intense sound?This question is from textbook College Mathematics II
Click here to see answer by Earlsdon(4898) |
Question 215921: Please solve each step and show your work.
Part 11: 5^(2x+1)=8
Step 1: Take the common logarithm of both sides of the equation. Use the power property to bring the exponent, (2x+1), down as a factor.
Step 2: Solve the equation from step 1 for x. Round your final answer to the nearest hundreth.
Click here to see answer by Alan3354(6059) |
Question 216764: I guess that I need help with this one too!
A bacteria population doubles every four minutes. If the population begins with one cell, how long will it take to grow to 1,024 cells?
I know I need to use this formula A=Pe^rt or at least I think so.
Click here to see answer by Alan3354(6059) |
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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, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510
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