In this task you will be given a list of lists, of numbers. For every inner list, you should multiply every number in that list and put the results in your answer. The output should be a list of numbers with the same length as the number of the lists in the input list.
[[-40, 46, 38, -9], [27, 33], [-37, 49], [-18, 35, -40, -31, 42], [0, 9, 28], [3, 6, 13], [-39, -34], [-31, -23, -28, -13]]