quadradics problem

Question

a stone is thrown downward from thetop f a building with an initial speed of 15 feet per second: the distance d in feet that it falls in t seconds is d=16t +15t. How many seconds will it take for the rock to goa distance of 162 feet?

Answer 1

your formula is wrong; first term (effect of gravity) should be 16t^2.

your spelling of quadratic is incorrect.

 

also, the height of the building needs to be stated; if it's < 162 ft, there is no possible answer.