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.
[[8, 35, -46, -37], [31, 9, 31, -8, -16], [18, 37, -13, -6], [25, -31]]