All i need to know is the answer to number one.

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.

Use the multiplier method to incrases £258 by 43%

What is the solution of sqrt x+2-15=-3