for the data points (1,1),(2,1/2),(3,1/3),(4,1/4), finde the natural cubic spline.

Answer:

y = -1/24 x³ + 5/12 x² − 35/24 x + 25/12

Explanation:

A cubic has the form:

y = ax³ + bx² + cx + d

Given four points, we can write a system of equations:

1 = a + b + c + d

1/2 = 8a + 4b + 2c + d

1/3 = 27a + 9b + 3c + d

1/4 = 64a + 16b + 4c + d

Solving this algebraically would be time-consuming, but we can use matrices to make it easy.

[tex]\left[\begin{array}{cccc}1&1&1&1\\8&4&2&1\\27&9&3&1\\64&16&4&1\end{array}\right]\left[\begin{array}{cccc}a\\b\\c\\d\end{array}\right]=\left[\begin{array}{cccc}1\\1/2\\1/3\\1/4\end{array}\right][/tex]

First, we find the inverse of the coefficient matrix.  This is messy to do by hand, so let's use a calculator:

[tex]\left[\begin{array}{cccc}1&1&1&1\\8&4&2&1\\27&9&3&1\\64&16&4&1\end{array}\right] ^{-1} =-\frac{1}{12}\left[\begin{array}{cccc}2&-6&6&-2\\-18&48&-42&12\\52&-114&84&-22\\-48&72&-48&12\end{array}\right][/tex]

Now we multiply by the solution matrix (again using a calculator):

[tex]-\frac{1}{12} \left[\begin{array}{cccc}2&-6&6&-2\\-18&48&-42&12\\52&-114&84&-22\\-48&72&-48&12\end{array}\right]\left[\begin{array}{cccc}1\\1/2\\1/3\\1/4\end{array}\right] =\left[\begin{array}{cccc}-1/24\\5/12\\-35/24\\25/12\end{array}\right][/tex]

So the cubic is:

y = -1/24 x³ + 5/12 x² − 35/24 x + 25/12

Tech A says never use a water hose to clean up dust after a repair. Tech B says never use a floor scrubber to clean up dust after repairs. Who is correct?

Question 14(Multiple Choice Worth 3 points)
(Lesson 7.2 LC)
The daily driving limit for time spent behind the wheel should be no more than
O two hours
Otwo to four hours
O six to eight hours
O a maximum of 12 hours

3 MAOP stands for which of the following?