A softball is thrown up into the air. The ball's height in feet is modeled by the equation h(t) = -16t2 + 32t + 5.
h = height
t = time in seconds
Find the maximum height of the ball.
a) 13.9 feet
b) 8.3 feet
c) 12.2 feet
d) 7.6 feet

Question

A softball is thrown up into the air. The ball's height in feet is modeled by the equation h(t) = -16t2 + 32t + 5.
h = height
t = time in seconds
Find the maximum height of the ball.  
 a) 13.9 feet 
 b) 8.3 feet 
 c) 12.2 feet 
 d) 7.6 feet

btaylor · Answer

if this were a graph, you would find the vertex by doing $$-\frac{b} {2a}$$
so, for this, the vertex/maximum is at -32/-32, or t = 1 second. now plug in 1 for t, and you get the max height.

anonymous · Answer

this is a recurring problem... the answer in those choices is not listed...