Pls help I don't wanna fail

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

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

Answer for 10 points show work you guys in advanced < 3