Two trains leave a station at the same time. one train returns to the station in 45 minutes and leaves again. the other train returns in 75 minutes and leaves again. how many trips and to the station which train make before they are back at the station again at the same time?

Create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

Is the figure congruent? yes or no?

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota