please help with this homework. sum of 2 dimensional array with different sizes. language is java

4. double[][] add(double[][] numss1, double[][] numss2) - that adds two 2-D double arrays together; returns a new array, - E.g. numss1: {{1,2,3},{4, 5}}, numss2: {{1,2},{3,4,5},{6,7}}, returns {{2,4,3},{7,9,5},{6,7}}