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# Tutor profile: Rushwell D.

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Rushwell D.
Tutor for 2 years
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## Questions

### Subject:Java Programming

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Question:

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Rushwell D.

public class testLL { public static void main(String[] args) { LL list = new LL(); for(int i =1; i <= 5 ; i ++) { list.addfront(i); } System.out.println(list); list.reverse(); System.out.println(list); System.out.println("Get each node by index"); for (int i=0; i < list.size; i++) { System.out.println(list.get(i)); } } }

### Subject:Calculus

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Question:

Find all the partial derivative with respect to x to the following function. f(x, y) = 2x sin((x^2)*y)

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Rushwell D.

f_x = 2x*cos(x^2*y). 2xy + 2sin(x^2*y) = 4x^2*ycos(x^2*y) + 2sin(x^2*y);

### Subject:Algebra

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Question:

Solve the following system of equations 3x + y = 13 x + 6y = -7

Inactive
Rushwell D.

Solution by Addition or Subtraction 3x + y = 13 x + 6y = -7 3x + y = 13 multiply to get equal coefficients 3(x +6y = -7) 3x + y = 13 subtract -3x -18y = 21 -17y = 34 y = -2 answer for y 3x + (-2) = 13 substitute to get answer for x 3x = 15 x = 5 Solution by Substitution 3x + y = 13 x + 6y = -7 y = 13 -3x solve first equation for "y=" x + 6(13 - 3x) = -7 substitute into the second x + 78 - 18x = -7 -17x + 78 = -7 -17x = -85 x = 5 answer for x 3x + y = 13 substitute to get answer for y 3(5) + y = 13 15 + y = 13 y = -2

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