If a ball is thrown into the air with a velocity of $58 ~~\mathrm{ft} / \mathrm{s}$ , its height (in feet) after t seconds is given by $H=58 t-18 t^{2}$ . Find the velocity when $t=9 .$
A) $-20$
B) $-23$
C) $-18$
D) $-22$
E) $-25$

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The Answer of If a ball is thrown into the air with a velocity of $58 ~~\mathrm{ft} / \mathrm{s}$ , its height (in feet) after t seconds is given by $H=58 t-18 t^{2}$ . Find the velocity when $t=9 .$
A) $-20$
B) $-23$
C) $-18$
D) $-22$
E) $-25$

If a Ball Is Thrown into the Air with a Velocity