PLEASE HELP (I'm giving 30 points)

Find the sum of the series...

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.

Whose conclusion is correct? choose all that apply. (two max) elijah emily edward esme

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41