College Math
posted by Yvonne .
The "learning curve" describes the rate at which a person learns certain tasks. If a person sets a goal of typing N words per minute (wpm), the length of time t (in days) to achieve this goal is given by the following formula. t=62.5ln(1N/80)
(a) According to this formula, what is the maximum number of words per minute?
(b) Solve for N.
.

College Math  typo? 
Steve
ln(x) is only defined for x>0, so 1N/80 > 0
That is, N<80
The problem here is that 1N/80 < 1, so ln(1N/80) is negative. But, t must be positive.
Typo?
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