a. ∥F1+F2∥=52.9lb\|\bold{F_1} + \bold{F_2}\| = 52.9 lb∥F1+F2∥=52.9lb; b. Los ángulos directores son α=74.5o,β=36.7o\alpha = 74.5^o, \beta = 36.7^oα=74.5o,β=36.7o y γ=57.7o\gamma = 57.7^oγ=57.7o.