Math 181 Miniproject 4: Linear Approximation and Calculus.md
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Math 181 Miniproject 4: Linear Approximation and Calculus
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**Overview:** In this miniproject you will put the idea of the *local linearization* of a function to build linear approximations to complex functions and then make *interpolations* and *extrapolations* using them.

**Prerequisites:** Sections 1.8 in *Active Calculus*, which focuses on this topic. **Completion of Miniprojects 1 and 2 is recommended before doing this miniproject**.

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1\. A potato is placed in an oven, and the potato's temperature $F$ (in degrees Fahrenheit) at various points in time is taken and recorded in the following table. The time $t$ is measured in minutes.
| $t$ | 0 | 15 | 30 | 45 | 60 | 75 | 90 |
|----- |---- |------- |----- |----- |------- |------- |------- |
| $F$ | 70 | 180.5 | 251 | 296 | 324.5 | 342.8 | 354.5 |

(a) Use a central difference to estimate $F'(75)$. Use this estimate as needed in subsequent questions in this problem.
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(a) f(75) $$(f(90)-f(60))/90-60$$
(354.5-324.5)/30
f'(75)=1degree/min

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(b) Find the local linearization $y = L(t)$ to the function $y = F(t)$ at the point where $a = 75$.
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(b) F'(75)[t-75]
=L(t)-F(75) L(t-75)
L(t)-48
L(t)=t+267.8

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(c\) Determine an estimate for $F(72)$ by employing the local linearization. Terminology: This estimate is called an *interpolation* because we are estimating a value that lies within a data set, between two known data points.
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(c\)L(t)=72+267.8
=339.8 degrees F

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(d) Do you think your estimate in (c) is too large, too small, or exactly right? Why?
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(d) It is an overestimate, because from the table f(t) is decreasing, f(t) is concave down, meaning the tangent line is above f(t).

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(e) Use your local linearization to estimate $F(100)$. Terminology: This estimate is called an *extrapolation* because we are estimating a value that lies outside the range of values of a data set.
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(e)F(100)=100+267.8
=367.8 degrees F

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(f) Do you think your estimate in (e) is too large, too small, or exactly right? Why?
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(f) F(100) is an overestimate, it is similar to F(72) in that is going to be above the graph f(t). They both will change the graph if they are plugged in.

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(g) Plot both $F$ and $L$ and comment on how or when the line $L(t)$ is a good approximation of $F(t)$.
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(g)https://www.desmos.com/calculator/aufcjn4tum

Line L(t) is a good approximation is when F(t) is close to the point of reference, anything further from the calculations would be to inaccurate to plot.

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