Help I have no idea how to solve this A coin is tossed upward from a balcony 228ft high with an initial velocity of 32 ft/sec. During what interval of time will the coin be at a height of at least 100ft? (h = -16t^2 + v0t (the zero is below v) + h0 (the zero is below h)

Talia took the bus from her home to the bank and then walked back to her home along the same route. the bus traveled at an average speed of 40 km/h and she walked at an average speed of 5 km/h. to determine the time, x, that it took talia to walk home, she used the equation 40(0.9 – x) = 5x. the time of trip 2 is hours. the distance of trip 1 is km.