Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 576t. after how many seconds does the projectile take to reach its maximum height? show your work for full credit.

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.