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Math - logs

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Math
Logs are stacked up in apile as shown in the figure. The top row has 15 logs and the bottom row has 21 logs. How many logs are in the stack? a1= 1+14=15 an= 7+14=21 s1=(n/2)(a1+an) (n/2)(15+21) = 18 How do I figure out the n?

Physics
Raft made of 2.2m long pine logs.Average diameter of logs 26cm.How many logs are needed to strap together to build raft to hold max 4 ?What percent of the logs is under water when you are on your raft in the water with your friend?

Physics
Raft made of 2.2m long pine logs.Average diameter of logs 26cm.How many logs are needed to strap together to build raft to hold max 4 people? What percent of the logs is under water when you are on your raft in the water with your friend?

Physics
PART 1 Raft made of 2.2m long pine logs with Average diameter of logs 26cm.How many logs are needed to strap together to build raft to hold max 4 people? Density of log = 600 kg/m^3 Each people weights 512N PART 2 What percent of the logs is under water when you are on your ...

math - natural logs
Find the EXACT solution to e^(1-x) = 4^x You must use logs, not just a calculator.

math logs
solve 3^(2x+1) = 9^(2x-1) using base 3 logs

algebra
200 logs are stacked so that 20 logs at bottom row 19 in the next ,18 in the next and so on.In how many rows can 200 logs be arranged and how many are there on the top row ?

Precalculus
.5=e^(-20t) I am assuming this involves logs but we did't really learn logs. Anyone care to walk me through with a calculator. Have the Ti-83

Maths (Logs)
1.Write the following equation without logs log y = mx+ c This would be y = 10^(mx+c) right? 2. Explain why this fits the exponential model (in other words, it can be written in the form y = a x b^x where a and b are real numbers).

Pre Cal (logs)
I need help with these logs 1: Log underscore4 16X 2: 2 Ln ( X(sqr. root)e 3:5^[2logUnderscore5(3x)] 4:log underscore2 ^[1280-logunderscore2 5) I don't understand how to do them thanks

math
Mr Logan can saw 8 logs in 3 hours. How many logs can Mr Logan saw in one hour?

chem
"Yule logs are simulated wood logs make of compressed paper that burn with a red and green flame.How would you produce a similar yule log?"

Physics
A raft is made of 14 logs lashed together. Each is 29.5 cm in diameter and has a length of 6.50 m. How many people (whole number) can the raft hold before they start getting their feet wet, assuming the average person has a mass of 75.0 kg? Do not neglect the weight of the ...

Quantative Method
Generate your Unit transportation costs (in excel) 1. Ship construction logs from 8 provinces in Canada to 50 states in the U.S. Minimize total shipping cost. 2. Set up the demand in each state of the U.S. 3. Set up availability of logs in the 8 provinces of Canada

chemistry
help required in calculating the pH value of a .84 mols per litre solution of sulfuric acid. I understand that pH = -log 10 (2x 0.84), I am not very experienced with logs and need assistance as to which keys to press on the scientific calculator in relation to the logs. thank ...

more pre cal logs
sorry I am so lost I missed the class that talked about logs since my sister was in the hospital giving birth to a still born baby.... now I am all lost... Expand the log Ln 3sqrootx^2y/x+3 (the 3 is part of the sqroot not infront like the 3rd power) I hope that makes since

Physics
A raft is made of 15 logs lashed together. Each is 30.0 cm in diameter and has a length of 7.00 m. How many people (whole number) can the raft hold before they start getting their feet wet, assuming the average person has a mass of 66.0 kg? Do not neglect the weight of the ...

Logs-Algebra
How do you graph the following logs? f(x)=log5 (x-2) f(x)=log5 x-2 f(x)= log5 x f(x)=log5 (x+2)

math - logs
2 ln (x) = ln (20-x)

Math logs
10^3x-8=2^5-x

Statistic
At peak periods 15 of attempted logins to an email service fail. log-in attempts are independent and each has the name probability of failing. Ann logs in repeatedly until she succeeds A. Find the probability that Ann needs to log in atleast four times before she succeeds B. ...

math
solve with logs 3^(1-2x)=4^(x)

Math - logs
the log(10^ -1)of 3.66 = of 9.86 = of -2.8 = thank you

math
how do i solve these logs? log1/2 (3x+1)^1/3= -2 3^(x^3)= 9^x

Math 12 (Logs)
Solve: 3^(2a+3)=7^(a-4) Please Help and Thank you

math- logarithms
how do i solve these logs? log1/2 (3x+1)^1/3= -2 3^(x^3)= 9^x

math
How would I simplify this problem using logs? (25/16) -3/2

math
how do you solve for x using logs: [(a + b)^x]/b^x I am not sure of the steps to get there.

Math
Could you check these pleas? Firewood usually sold by a measure known as a cord. A full cord may be a stack 8x4x4ft or a stack 8x8x2ft 10. what is the volume of a full cord? 8*4*4=(128ft) 11. A short cord or a face cord of wood is 8x4xThe lenght of the logs. What is the volume...

Science
Which of the following materials will burn the fastest in open air? A. a log, two feet in diameter B. two logs, each one foot in diameter C. a pile of small splinters made from a two-foot diameter log D. Both logs and the splinters will burn at the same rate.

Science
Which of the following materials will burn the fastest in open air? A. a log, two feet in diameter B. two logs, each one foot in diameter C. a pile of small splinters made from a two-foot diameter log D. Both logs and the splinters will burn at the same rate.

math - logs
if logx3 = a and logx25 = b, determine an expression for logx(9/5).

LOGARITHMS
HI THE QUESTION STATES THAT ONE SHOULD CALCULATE THE LOGS WITHOUT THE USE OF A CALCULATOR...OKAY MY PROBLEM IS THIS... 2 3 2log 8 + 2log 8 what should i do? i had come to the piont of... 4 5 log 8 + log 8 But what's to do now i don't know..Think u can help?... cheers michelle ...

math logs - please help
True or false: 2 ln x / ln 5 = ln x^2 - ln 5 for all positive values of x.

math condense logs
write the expression as the logarithm of a single quantity 3[ln x-2 ln(x^2+1)]+2 ln 5

math
5 divided by (3-e to the -x power)=4 5/(3- e^-x) = 4 5 = 12 - 4 e^-x 4 e^-x = 7 e^-x = 7/4 e^x = 4/7 Take natural logs of both sides, x = ln (4/7) = -0.5596

math
also a problem that i cant figure out is how to do inverses of logs f(x)= 2log(base2)X

Math (logs)
In x = -3 find x. I worked it out like this e^inx= e^-3 then I got x = 1/e^3. Is that correct?

exponential and logarithmic graphs question
hi, i desperately need help solving this question: Find the values of A and k if the general equation of the graph shown is y=Ae^kx where the graph goes through the points (-1,-4) and (-2,-10) do i solve it using simultaneous equations? because i have attempted this yet failed...

Math (check please)
Could you check these please? Firewood is usually sold by a measure known as a cord. A full cord may be a stack 8x4x4ft or a stack 8x8x2ft 10. what is the volume of a full cord? 8*4*4=(128ft) 11. A short cord or a face cord of wood is 8x4xThe lenght of the logs. What is the ...

Logarithms
How do I solve this using logs? I am having a total math meltdown tonight! 10=2^10/n Thanks again!

Math
solve for x without using a calculator: log5(3^x) = log25(9^(1-2x)) I don't know how to get rid of the logs for this one. Help? Thank you!

math
How would you condense a logarithm expression into a single quantity if the logs have different bases?

MATH 1111
College Algebra help with logarithms! Ln (x-4) - Ln (x+1) = 16 How do I take natural logs?? it's a study guide question for our final exams

Math
1. Given the product law of logarithms, prove the product law of exponents. 2. Given the quotient law of logarithms, prove the quotient law of exponents. 3. Apply algebraic reasoning to show that a=b^(loga/logb) for any a,b>0 Please explain these to me. All I know is that ...

Algebra 2
logs?

Math logs
Solve the system of equations: y= (lnx)^2 + 2 (lnx^2) y = 3ln(1/x^2)+24 Im not sure what to do..

calculus
Differentiate y=lnx You ought to have this memorized. y'=1/x for y= ln x dy/dx = 1/x This is the most basic and fundamental of log derivatives. If you are studying Calculus, and the topic is logs, I fail to understand why you asked that question. IS there a website that can ...

Math Logs
logbase4(x+5)=3+logbase4(x-2) Tried so many times please help!

Science
3. Which of the following conditions would likely cause the activation energy to be high? A.atoms are close together B.the temperature is hot C.atoms are not close together * D.a catalyst is present 4. Which of the following materials will burn the fastest in open air? A.a log...

natural logs
Solve for x: ln(x+1)+ 2 = x^2 – 8x + 12

natural logs
solve for x. xe^x = 9

logs
How do you solve: log (1/3) 1 ?

algebra: logs
Log3x=4

Math
Which term is 13122? The geometric sequence is 2, -6, 18, -54 tn=ar^(n-1) 13122=2(-3)^(n-1) 6561=(-3)^(n-1) log6561=n-1log-3 You can't divide with negative logs, how do I isolate n?

math. logs
anyone know how to solve this step by step? e^(3ln2)

Math - logs
the log(10^ -1)of 3.66 = of 9.86 = of -2.8 = please help. (the 10^-1 is the subscript to log)

maths
solve for x 8=6^x using logs

precal
logs 9^(2x-5)=27(x+4) and 3log(underscore4)(2x-1)=15 Thank you

precalculus logs
what is the domain of f(x)=-ln(-x) and the inverse

algebra
solve e^x / 3 = 5^x using logs.

LOGS (ALGEBRA)
FIND THE INVERSE: f(x) = 10^(5x+3) - 10 f^-1(x) =

logs
e^1−10x=9 solve for x

Exponents and Logs (Math)
Solve for x: 2^(-x+1) = 4(8^x) I try isolating the 4 but I can't seem to solve it correctly when using ln or log applications. The answer is supposed to be x=-1/4. Any help?

Precalculus
This is for solving exponential/logarithmic functions: (This is a base e Logarithmic function I would assume): e^(4x)/10 =4^x-2 ? I understand the properties of logs for the most part, but I have a hard time figuring out the step-by-step process on how to solve exponential/log...

Precalc
if you have how do u do 2^2x - 2^x - 6 =0 (calc)how do u do it? using logs??

Logs
log6(x+7)−log6x=2 Solve for x

logs 3
How do you create a table to graph log (3/2) x ???

calculus
Solve the equation 14=65(19)x for x using logs.

Algebra logs please help
Log3(x)=log9(6x)

physics
You are planning to build a log cabin in northern Minnesota. You will pull the logs up a long, smooth hill to the building site by means of a rope attached to a winch. You need to buy a rope for this purpose, so you need to know how strong the rope must be. Stronger ropes cost...

Logs
Solve for x. log5x=(1/2). Express the answer to the nearest hundredth.

Algebra
express log (3x^5y^3/z^3) as the sum and difference of logs with no exponents.

Math
I understand generally how to solve, by taking natural logs and the the derivative, but i am confused by the presence of the 3 in front... if f(x)= 3(sin(x))^x, find f'(1) should i move 3 to the y side or take the natural log of it? Thanks!

Langauge
Underline the complete compound predicate. Circle the verbs.. 1/ Millworkers peel logs or cut boards. Complete pradicate: peel logs or cut boards. Verb: peel 2/ truckers load the boards and deliver them. C.p: load the board and deliver them. V.: load 3/ merchants sell products...

natural logs
solve for x. xe^x = 9 please help i am stuck. i keep going in circles.

logs
log (base 8) 1 = ??? I know it's 8 to some power gives me 1, but I can't figure it out.

solving for x math
2e^(4x^2)=3 how do i solve for x. do i use the ln methode because i don't know how to do that. by calculator, i got x=.168 but i don't know how to show my work. please help me solve for x. Take natural logs of both sides. ln 2 + 4 x^2 = ln 3 4 x^2 = ln (3/2) = 0.40547 x^2 = 0....

Math
How would you solve a problem like this with logarithims? I tried to start a couple of different ways but I kept getting stuck. Do you take the logs of both sides right away or do you do something else first? 17c^2/3 = 44

Math-LOGS
Express x in terms of a,b and c. log x = 1/2 (log a + log b - log c) Please solve and explain how to do this type of problem, thank you!

Math Repost (Logs)
.704=log(100/x) I tried this 10^.704=10^(100/x) But i not sure what to do now?

Precalc (LOGS)
1. (e^x - 1 )/(x^2 - 1) < 0 2. The inverse of ln (3 - x) ? 3. Simplify x^3 - 3x^2 + 2 = 0 Any help would be GREATLY appreciated. Thank you so much for your time.

math
If you can cut three logs in six minutes. How many minutes will it take to cut 8? 16 is not the answer.

Math - logs
I need help solving this because it involves 2 bases: log (base 2) [log (base 5) 25]= ???

social studies
mahogany logs from central America sometimes wash up in scotland. how do you explain this?

Alg 2
How do you simplify this expression? It gets confusing b/c of logs and exponents. Can someone help me explain how to do this. 8^log(8)x

PreCalculus
Assume that x y and a are positive numbers. Use the properties of logs to write the expression log a 9(squrt)xy.

misplaced nodifier
we finally found the fire extinguisher we had been hunting for behind a pile of logs

Precalc
I need help with logs. Thank you! Evaluate. 1. log base(3) 25 to the cubed root Condense. 2. 1/3logx + 2logy^3 -3log(z+1)

Logs
Determine the domain of the following functions, write answer using interval notation. T(x)=log12(x^2+14x)

math- exponents and logs
5,000=55.66 (1.114)^x (i.e. What is x?) ln 5,000= x ln 55.66 1.114 I keep getting 2 point something, but does this make sense? My calculator display looks like this: ln 5000/ln (55.66)(1.114)

Math - Logarithmic
Is the following correct when restating logs with variables to exponential? Log: log_a(a^3) --- base = a Exp: a^3 = a I know when dealing with real numbers, this is what you do: Log: log(10^5) Exp: 10^5 = 100 000

math
the population of Smallville in the year 1890 was 6250.assume the population increased at a rate of 2.75% per year. predict when the population reached 50,000 I'm not suppose to use logs to find the answer :(

algebra 2
find the points of intersection of the following algebraically y=2^x + 4^x y=2^x+1 - 4^x+1 I set them equal to each other but not sure if you use logs or what to solve it

math
I need an expression written for the following logs using "sum, difference, or multiple of logarithms." a) log[base(2)] ((x^2) - 9)/(x^3))^3 b) log[base(a)]5a^4 Hopefully they are clearly written. thanks. -roberto

Natural Logs
When you are subtracting functions with ln, I know you divide the numbers after ln, but what do you do with constants in front of ln? For example, I'm currently dealing with: 4ln8 - 4ln3 Thanks!

trigonometry
(3^m)(5^(m+1))=12^(2m-1) not sure how to solve this but I think you use natural logs? I'm just stuck because the first two are multiplying and not adding and we didn't go over this

language arts
Three Indian elephants patiently towed the logs that had just been cut. is this an adverb clause

math-logs
1. logaB = 2 and logbC = 4, evaluate logcA *the lowercase letters are bases ie. log(base a)B 2. solve for x: (log(base 2)x))^3 = log(base 2)x

Math
What is the real value of x in the equation log(subscript 2)24-log(subscript 2)3=log(subscript 5)x? I really cannot remember at all how logs work. I know the answer is 125 but have no idea how to get there. Thanks in advance.

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