Wich one of these numbers is an rational but not an integer -9 , 0-4.3, 3

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.

Given this information, which expression must represent the value of b?

What is the 12th term of b(n)=-4-2(n-1)