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please help! ASAP

2007-06-10 14:45:37 · 4 answers · asked by Anonymous in Science & Mathematics Mathematics

4 answers

Here is an instance where you must use a logarithm in order to isolate the variable. Try using log base 10 its usually the easiest and is always denoted just log.
In this case taking a log would result in:
5^t=11^5+t
The log will bring the exponent down in front like so:
t(log5)=(5+t)log11
Now distribute on the right:
tlog5=5log11+tlog11
Now reverse sides:
-5log11=tlog11-tlog5
Factor out the t:
-5log11=t(log11-log5)
Now get a general idea of log11-log5:
-5log11=t(.3424226)
Now divide -5log11 by .3424226
-15.20624572=t

2007-06-10 14:56:00 · answer #1 · answered by J Reed 2 · 0 0

set the equation equal to zero and then use the quadratic formula which is right here:

http://www.gomath.com/htdocs/images/4-3-03(1).gif

unless it is 11^(5+t), in which case that logarithmic answer above is probably right

2007-06-10 22:22:38 · answer #2 · answered by Alex B 2 · 0 0

5^t=11^5+t

t log 5 = (t + 5)log 11

t/(t + 5) = log 11/log 5

t/(t + 5) = log 11/log 5

t/(t + 5) = 1.49

t = 1.49(t + 5)

t - 1.49t = 7.45

-0.49t =7.45

t = -15.2
.

2007-06-10 21:57:09 · answer #3 · answered by Robert L 7 · 0 0

the answer is 7 duh i am a mathematics professor Just playin !! goodluck

2007-06-10 21:56:11 · answer #4 · answered by ? 3 · 0 1

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