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**1. Homework Statement**

The mass, m(t), in grams, of a tumor t weeks after it begins growing is given by m(t) = [te^t] / 80 .

What is the average rate of change, in grams per week, during the fifth week of growth?

a.) 2.730

b.) 3.412

c.) 6.189

d.) 6.546

e.) 11.131

**2. Homework Equations**

The Mean Value Theorem (MVT) for Derivatives states that the average rate of change between two points is the secant line between those two points given by the equation:

f ( b ) - f ( a ) / b - a

**3. The Attempt at a Solution**

Since m(t) is the mass of the tumor, and we're looking for average rate of change (the slope of the secant line), we must use the MVT for derivatives.

I performed the following calculation:

m (5) - m(0) / 5 - 0 .... but got 1.8555.... not one of the answer choices.

Is my logic wrong?