Physics HELP!!
posted by Ann .
Forces of 11.1N north, 19.9N east, and 14.0N south are simultaneously applied to a 3.62kg mass as it rests on an air table. What is the magnitude of its acceleration?
b) What is the direction of the acceleration in degrees? (Take east to be 0 degrees and counterclockwise to be positive. Enter an angle between 180 degrees and +180 degrees.)

F(x) =F1(x)+F2(x)+F3(x) =0+19.9 +0 =19.9 N
F(y) =F1(y)+F2(y)+F3(y) =11.1+014=3 N
F=sqrt{F(x)^2 + F(y)^2}
a=F/m
tan alpha=F(y)/F(x)
unknown angle =appha +90 degrees