What is the Surface area

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

Plz hurry evaluate the expression a+b where a=8 and b=19

Which number line correctly shows 0.8 + 0.3?