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.
[[49, -17], [15, -34], [44, 38], [18, -41, 49], [-28, -12, -2, 42]]