(Algebra: multiply two matrices) Write a method to multiply two matrices. The header of...

(Algebra: multiply two matrices) Write a method to multiply two matrices. The header of the method is:

public static double[][]

multiplyMatrix(double[][] a, double[][] b)

To multiply matrix a by matrix b, the number of columns in a must be the same as the number of rows in b, and the two matrices must have elements of the same or compatible types. Let c be the result of the multiplication. Assume the column size of matrix a is n. Each element

For example, for two 3 × 3 matrices a and b, c is