Ineed i can't figure this out and i'm doing test corrections and i don't understand this

An arrow is shot vertically upward at a rate of 180ft/s. use the projectile formula h=−16t2+v0t to determine at what time(s), in seconds, the arrow is at a height of 420ft. round your answer(s) to the nearest tenth of a second.

The empire state building in new york city is 1454 feet tall a model of a building is 24 inches tall what is the ratio of the height of the model to the height of the actual empire state building

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?