Homework Help: Logarithms

Posted by Amy on Tuesday, September 4, 2012 at 8:34pm.

I need help evaluation the following:

1.) (1/15)^2.309

It says hint: set the expression = x and take the logs of both sides.

I did: x=(1/15)^2.309
logx = log(1/15)^2.309 = 2.309 log(1/15)
and I don't know how to proceed or if I'm on the right track.

2.) Find the base x for which
logx (4.44 * 10^4) = 4.44

Hint: write the corresponding exponential expression.

I did 4.44^x = (4.44 * 10^4)

Logarithms - Reiny, Tuesday, September 4, 2012 at 8:49pm
logx = log(1/15)^2.309 = 2.309 log(1/15)
so far ok

log x = 2.309(-1.17609...)
= -2.71559..

now press the following on your calculator
2ndF or INV
log
=.001924887

check by using the y^x key
enter
1÷15
=
y^x
2.309
=

you should get .001924887

2.
logx (4.44 * 10^4) = 4.44
so x^4.44 = 4.44 *10^4
log x^4.44 = log(4.44 * 10^4)
4.44 logx = log 4.44 + log 10^4
log x = 4.64738..
x = 44400

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