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.
[[15, -40, -37], [18, 2, 17, 16, 29], [-35, 50, -10, -39, 46], [18, -48, -45, -4]]