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.
[[45, -31, 18, -37, -3], [2, -6, 31], [-47, -4, 34], [-26, -38, -44, 34, 44], [-8, 15, 26, 49, 31]]