Answer:
6,300,000,000,000,000
Explanation:
First, you want to find out much the answer will be for the powers. That means doing 10 to the 8th power and 10 to the 6th power. Once you get that, put it aside. Next, you want to go ahead and multiply 7 and 9. After you do that all you will have left is 100000000 x 1000000 x 63. Last, all you have to do is multiply 100000000 by 1000000 and that's easy because all you have to do is add the 0's and end up getting 100000000000000. Now, all you do is multiply that by 63 and you get 6,300,000,000,000,000. Hope this was helpful.