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: [[-21, -29], [-6, -11, -42, -4, -45], [25, -42]]

[609, -498960, -1050]