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mixer [17]
3 years ago
13

The south beach diet was given to a volunteer group of 25 people who were atleast 25 pounds overweight. Eighteen people from the

group lost atleast 20 pounds. What should we conclude about the effectiveness? A. Nothing, since the group knew they were using the diet. B.The diet is effective in 72% of people. C. Nothing, since the 25 people were not an SRS. D. Nothing, since there was no control group. E People overweight by atleast 50 pounds will lose more than 20 pounds on the diet
Mathematics
1 answer:
Dahasolnce [82]3 years ago
3 0
D. Nothing, since there was no control group.
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kirill [66]
Explanation

We must the tangent line at x = 3 of the function:

f(x)=(\ln x)^3.

The tangent line is given by:

y=m*(x-h)+k.

Where:

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,

• k = f(h) is the value of the function at x = h.

In this case, we have h = 3.

1) First, we compute the derivative of f(x):

f^{\prime}(x)=\frac{d}{dx}((\ln x)^3)=3*(\ln x)^2*\frac{d}{dx}(\ln x)=3*(\ln x)^2*\frac{1}{x}=\frac{3(\ln x)^2}{x}.

2) By evaluating the result of f'(x) at x = h = 3, we get:

m=f^{\prime}(3)=\frac{3}{3}*(\ln3)^2=(\ln3)^2.

3) The value of k is:

k=f(3)=(\ln3)^3

4) Replacing the values of m, h and k in the general equation of the tangent line, we get:

y=(\ln3)^2*(x-3)+(\ln3)^3.

Plotting the function f(x) and the tangent line we verify that our result is correct:

Answer

The equation of the tangent line to f(x) and x = 3 is:

y=(\ln3)^2*(x-3)+(\ln3)^3

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