If x, y and z are positive integers and 3x=4y=7z,
then the least possible value for x + y + z is

(a) 33
(b) 40
(c) 49
(d) 61
(e) 84

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