SOLUTION: A toy rocket launched into the air has a height (h feet) at any given time (t seconds) as h = -16t2 + 160t until it hits the ground. At what time(s) is it at a height of 9 feet ab

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A toy rocket launched into the air has a height (h feet) at any given time (t seconds) as h = -16t2 + 160t until it hits the ground. At what time(s) is it at a height of 9 feet ab      Log On

To answer the question, you need to solve the equation

    h(t) = 9,

which is

    -16t^2 + 160t = 9.


You write it in the standard form

    16t^2 - 160t + 9 = 0


and solve using the quadratic formula.