H(t) = t + 2 + 3; Find h(6)

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.

Ihave trouble finding the nth term of a linear sequence

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*