Vector cc has a magnitude of 24.624.6 m and points in the −‑−y‑ direction. vectors aa and bb both have positive ‑y‑ components, and make angles of α=42.4°α=42.4° and β=25.2°β=25.2° with the positive and negative - axis, respectively. if the vector sum a+b+c=0a+b+c=0 , what are the magnitudes of aa and b?