Tom wants to buy a used car and needs to have a down payment of 10%. If the car Tom wants to buy costs $1,800, how much down payment will he need?

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.

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Anyone know? will mark brainliest if correct