Which best describes the rule for this pattern 1,-12, 12,-1

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

Using elimination, what is -4x+2y=-12 4x+8y=-24

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?