Problem 4 ( Create a MATLAB script that calculates the letter grade for a given score input by the user. Use the following grading scheme: 90 and above: 'A' 80 to 89: 'B' 70 to 79: 'C' 60 to 69: 'D' Below 60: 'F' Ensure your script correctly handles unexpected inputs like negative numbers or non-numeric values.

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A: The difference between Gauss – Jacobi method and Gauss – Seidel method given below.

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A: Dear learner, hope you are doing well, I will try my best to answer this question. Thank You!!

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Q: 4. In MATLAB, plot the curve of the quadratic equation 3x2 - 9x - 12 = 0. Both the roots of the…

A: Write a MATLAB program to plot the curve of the quadratic equation 3x2 - 9x - 12 = 0. Both the roots…