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: [[13, -46], [31, -9], [-40, -12, 23], [-19, -7, -13]]

[-598, -279, 11040, -1729]