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: [[49, -35], [33, -37, 25, -26], [4, 19, -23, 28, -15]]

[-1715, 793650, 734160]