Afireworks rocket is shot straight up from a 50-foot-high platform at an initial speed of
90 feet per second. as the rocket travels, earth's gravity slows it down.
the height of an object dropped from a height of 50 feet is given by
g(t) = -16t2 + 50.
the distance in feet traveled by an object at a constant speed of 90 feet per second is
given by k(t) = 90t.
these two functions can be combined to build a new function, f, that models the
height of the rocket as a function of time in t seconds.
which choice shows how to combine g and k to build f?