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.
[[26, -28], [30, 22, -38, 26, -29], [9, -37], [34, 18, 21, -30]]