Two friends are sitting on a seesaw at the park The height h t of the left seat in inches above the ground Is modeled by a sine function Let t represent the time in seconds since the friends started seesawing t h t 0 24 O A 4 seconds 1 48 O B 6 seconds OC 3 seconds OD 2 seconds 2 24 3 0 4 24 f the friends start seesawing with the plank in a level position how long does it take for the friend in the left seat to move upward downward and then back to the initial position 5 48 6 24