Answer
1400 feet
Work Step by Step
We are given that the height of a projectile at any time t can be described by the polynomial function $P(t)=-16t^{2}+300t$.
In order to find the height at $t=10$ seconds, we can calculate the value of $P(10)$.
$P(10)=-16(10^{2})+300(10)=-16(100)+3000=-1600+3000=1400$ feet
