Math  Bases
posted by Laura .
What is 12 base 5? Would you just divide 12 by five and get 2 (but then what about the remainder)
If you are refering to logs, 12 base 5 means log of 12 to the base 5. Call it x.
5^x = 12.
x = log 12/log 5 (any log base can be used)
x = 1.07918/0.69897 = 1.54396
If "5" is refering to the base of a counting systems, and you can write only singledigit numbers 0,1,2,3, 4, then 12 (in the tensbased terminology that we use) is two 5's (5^1) and 2 ones (5^0), and would be written 22.

I'm looking for help with these maths problems
Respond to this Question
Similar Questions

check!
here is the question: log5(x4)= log7x solve for x. These are just base 10 logs. log100 = 2 This equation has the same format as log 40 = log (2x20) Since both sides have log base 10, you divide by log base 10 and end up with 5(x4) … 
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? 
Review of Logs
I can't seem to get the answer to this; the answer key says log(base 8)6 Write as a single logarithm log(base 8)42log(base 8)3  log(base 8) 6 I'm hoping the key is wrong :) Thank you for your help! 
math
i have 2 math questions i don't understand so if you could help me i would like that. Log base 3 64log base 3 (8/3)+log base 3 2=log base 3 4r Log base 6 (b^2+2)+logbase6 2=2 
algebra 2 logs and trig
log(base 2)cotx  2log(base 4)csc2x = log(base 2)cosx the answer should be x = pi/3, 5pi/3 not sure how to work it out though, any help? 
mathlogs
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  logs
I need help solving this because it involves 2 bases: log (base 2) [log (base 5) 25]= ? 
precalc help
Find the exact value without a calc 1. log base 3 of 8 times log base 8 of 9. I started by changing both bases to 10 but don't know what to do from there. 2. e ^ log base e^2^9. I hope that isnt confusing. My teacher said we are suppose … 
Algebra 2
Explain the difference between log base b (mn) and ( log base b of m)(log base b of n). Are they equivalent? 
Econ math/logarithms
If log with base b (2)=0.39 and log with base b (3)=0.61 evaluate the following. log with base b (8). Simplify your answer. How to start?