Definition: 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.
Input: [[15, -44, -12, -42], [6, 29, -38, 13], [42, 29, -43, 14, 43]]

[-332640, -85956, -31529148]