Heyyy im back and i need some edvice !!

ttm!!

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.

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have