round to the place of the underlined digit 423,906583,342

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

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

M.xyz =radians. covert this radian measure to its equivalent measure in degrees.