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.
[[-24, 9, -19, 23], [9, -34, -16, -19], [-7, -45, 42, -36, 31], [-19, 40, -15, -16]]