Help with physics thanks?

Resultant force, F = (4.20 × cos50.0° + 2.25 × cos122°) N

F = ma
Acceleration, a = F/m = (4.20 × cos50.0° + 2.25 × cos122°)/3.74 m/s² = 0.403 m/s²

second law of newton
F = ma

4.20 cos(50) - 2.25cos(58) = 3.74 a