Withdrawing 10 everyday week from an outstanding balance of 400

Can someone me with these two circle theorem questions asap?

Asap! i'm not good math and i'm lost.

Me! i really need to get this right before 9. prove the divisibility of 7^6+7^5-7^4 by 11. use factoring so you get a number times 11. just tell me the number. i need this done asap