Answer
796 feet
Work Step by Step
We are given that the height of the football above the Colorado River at any time t can be described by the polynomial function $P(t)=-16t^{2}+10t+910$.
In order to find the height at $t=3$ seconds, we can calculate the value of $P(3)$.
$P(3)=-16(3)^{2}+10(3)+910=-16(9)+30+910=-144+30+910=796$ feet
