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August 4, 2015

Homework Help: math:solving for an exponent.

Posted by Sar on Tuesday, October 4, 2011 at 7:27pm.

I can't get the right answer, where am I going wrong?
7.0x10^9= (6.7x10^9)(2.72^r*3)
1.04 = 2.72^r*3

When I solve for this, I get ln (1.40) = 0.03922 then 0.03922 / 3 = 0.0130
So my r equals 0.0130

BUT the teacher says the answer is
0.05 = r *3
0.02 = r

What did I do wrong? I am so confused!! Help please. Show steps

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