Need help in math plz

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

On #16 : explain how factoring a trinomial, ax^2+ bx+ c, when a does not equal 1 different from factoring a trinomial when a = 1.

Two similar figures have sides in the ratio of 2: 3. if a side of the smaller triangle has a length of 7, what is the length of the corresponding side of the other triangle? 4 10 14 21