Why aren’t the arrow displayed when using Show?

I have been trying to combine different plots using Show. Everything looks fine, but the Arrow from one of the plots does not show. What am I doing wrong here?

qw = Plot[y /. Solve[(x/20)^2 + (y/10)^2 == 1], {x, -36, 35},  AspectRatio -> Automatic, PlotRange -> {{-37, 35}, {-16, 16}},  PlotStyle -> {RGBColor["#123c69"]}, Ticks -> Automatic,  Axes -> True]; Aq = Plot[-a/((x^4)) - b, {x, -21, -35},  PlotRange -> {{-36, -21}, {-6.5, -9.5}},  PlotStyle -> {RGBColor["#ac3b61"]},  Epilog -> {RGBColor["#ac3b61"],  Arrow[{{-35, -((3151 Sqrt[7])/     1250)}, {-35.7, -6.640033236810056}}]}]; Show[qw, Aq]