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.
[[21, -9], [21, -35, 0], [-32, -38, 19], [-5, -39, -46], [21, -42, -20]]