Find the measurement of the angle, no links pls

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

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

What is the domain of the given function? {(3,-2), (6, 1), (-1, 4), (5,9), (-4, 0); o {x | x= -4,-1, 3, 5, 6} o {yl y = -2,0, 1,4,9} o {x|x = -4,-2, -1,0, 1, 3, 4, 5, 6, 9} o y y = 4,-2, -1, 0, 1, 3, 4, 5, 6, 9}