[usth] Numerical Method is MATH2.4

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diff --git a/usth/MATH2.2/hw/README.md b/usth/MATH2.2/hw/README.md
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-# Numerical Methods: Homework 1
-
-My name is Nguyễn Gia Phong, my student ID is BI9-184.
-
-The homework were written in Octave and saved as
-
-* `linear`: interactive script to solve linear equation
-* `quadratic`: interactive script to solve quadratic equation
-* `cubic`: interactive script to solve cubic equation
-* `fibonacci.m`: function `fibonacci (n)` returning a vector containing
-  Fibonacci numbers from F<sub>1</sub> to F<sub>n</sub>
-
-The scripts are named without any file extension following the \*nix traditions.
-The homework can be downloaded as a whole in a ZIP package using the button
-near the top-left corner, or alternatively cloned using `git`:
-
-    git clone https://gist.github.com/McSinyx/1d9ff91d1ecfd60254c188bddb7926d5
-
-If this causes any inconvenience, please let me know.
-
-[![Creative Commons License](https://i.creativecommons.org/l/by-sa/4.0/80x15.png)](http://creativecommons.org/licenses/by-sa/4.0/)
-This work is licensed under a [Creative Commons Attribution-ShareAlike 4.0 International License](http://creativecommons.org/licenses/by-sa/4.0/).
diff --git a/usth/MATH2.2/hw/cubic b/usth/MATH2.2/hw/cubic
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-#!/usr/bin/env octave
-disp ("Solve quadratic equation a*x^3 + b*x^2 + c*x + d = 0");
-a = input ("a = ");
-while (a == 0)
-  disp ("a must be nonzero");
-  a = input ("a = ");
-end
-b = input ("b = ");
-c = input ("c = ");
-d = input ("d = ");
-
-% Using the trigonometric and hyperbolic solutions on Wikipedia:
-% https://en.wikipedia.org/wiki/Cubic_function
-p = (3*a*c - b^2) / (3*a^2);
-q = (2*b^3 - 9*a*b*c + 27*a^2*d) / (27*a^3);
-if (p == 0)
-  disp ("The given cubic equation has only one distinct solution:");
-  x = cbrt(-q) - b/a/3
-else
-  r = 2 * sqrt(-p/3);
-  disp ("The three solutions of the given quadratic equation are:");
-  for k = 0 : 2
-    x = r * cos((acos(3*q/p/r) - 2*pi*k) / 3) - b/a/3
-  end
-end
diff --git a/usth/MATH2.2/hw/fibonacci.m b/usth/MATH2.2/hw/fibonacci.m
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--- a/usth/MATH2.2/hw/fibonacci.m
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-function fib = fibonacci (n)
-  fib = 0 : n;
-  for i = 2 : n
-    fib(i + 1) = fib(i) + fib(i - 1);
-  end
-  fib = fib(2:end);
-end
diff --git a/usth/MATH2.2/hw/homework.pdf b/usth/MATH2.2/hw/homework.pdf
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--- a/usth/MATH2.2/hw/homework.pdf
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Binary files differdiff --git a/usth/MATH2.2/hw/linear b/usth/MATH2.2/hw/linear
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index fad7e67..0000000
--- a/usth/MATH2.2/hw/linear
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-#!/usr/bin/env octave
-disp ("Solve quadratic equation ax + b = 0");
-a = input ("a = ");
-while (a == 0)
-  disp ("a must be nonzero");
-  a = input ("a = ");
-end
-b = input ("b = ");
-
-disp ("The two solutions of the given linear equation is:");
-x = -b / a
diff --git a/usth/MATH2.2/hw/quadratic b/usth/MATH2.2/hw/quadratic
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--- a/usth/MATH2.2/hw/quadratic
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-#!/usr/bin/env octave
-disp ("Solve quadratic equation a*x^2 + b*x + c = 0");
-a = input ("a = ");
-while (a == 0)
-  disp ("a must be nonzero");
-  a = input ("a = ");
-end
-b = input ("b = ");
-c = input ("c = ");
-
-sd = sqrt(b*b - a*c*4);
-disp ("The two solutions of the given quadratic equation are:");
-x0 = (-b - sd) / a / 2
-x1 = (-b + sd) / a / 2