Quadrilateral abcd is reflected across the x-axis and then reflect across the yaxis to form quadrilateral a'b'c'd'. if the coordinates of vertex a
are (-7.3), what are the coordinates of vertex a?

the answer is two. hope this !

  or  

sin y = 7/q

7 is the opposite side length, q is the hypotenuse

tan y = 7/r

7 is the opposite side length, r is the adjacent side length

using sohcahtoa ^^^^

cos y = adjacent/hypotenuse

cos y = r/q