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.
[[-42, -2, -5, 9, -38], [50, 18], [-8, -10, 37, -43, -47], [-6, -45]]