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.
[[5, -42, 49], [-25, 1, -35], [-23, 23, 13, -46, -19], [16, -28, -25, 12]]