(n + 8) + (n - 12) whats the answer??

Someone answer this check out the image!

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

Is there an x intercept in the equation 60*1.15^x