Factorise 12g-20gh please

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

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

Tom drove 206 miles in 3.9 hours. estimate his average speed.