Lena is playing her accordion by compressing and stretching it. The accordion's length (in cm) t seconds after it's completely stretched is modeled by A(t). Here, t is entered in radians. A(t) = 25 cos (nt) + 65 How long does it take Lena to compress the accordion completely and then stretch it back out to a length of 50 cm? Round your final answer to the nearest tenth of a second. seconds