math
posted by ddd .
logarithm base 20 of 39

20^log20(39) = 39
log20(39) * log10(20) = log10(39)
so
log20(39) = log10(39)/log10(20)
= 1.59/1.30
Respond to this Question
Similar Questions

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
given that c is the logarithm of x in base a, and d is the logarithm of x in base b, find the general statement that expresses the log of x ib base ab, in terms of c and d. I couldn't include subscripts, but here are what the logs … 
precalculus
given that c is the logarithm of x in base a, and d is the logarithm of x in base b, find the general statement that expresses the log of x in base ab, in terms of c and d. [*subscripts not included: a,b,ab] loga_x=c ; logb_x=d ...logab_x … 
math
if y is equal to the logarithm of x to the base 5, what is the logarithm of x to the base 25 in terms of y? 
math
how do i solve this logarithm log(base 9)X + 3log(base 3)X = 14 
math
use the changeofbase formula to write the given logarithm as a multiple of a common logarithm. In 5 
math
Use the Laws of logarithms to rewrite the expression log(base 2)(11x(x9)) in a form with no logarithm of a product, quotient or power. After rewriting we will have: log(base 2)A+log(base 2)x+log(base 2)f(x) What is A and what is f(x)? 
Math 120
Write 4logb(X)1/3logb(y)+2logb(z)as a single logarithm Its log base b. 
Math 10
Express as sum or difference of logarithm log of x(3x5) to the base of 4 
logarithm
If log base 2 of x and log base 2 of y are distinct positive integers and log base x of 2 plus log base y of 2 equal to 0.5. xy=?