Give the Focus, Directrix, and Axis for the Parabola $$\mathrm { h } = - 14 \mathrm { t } ^ { 2 } + 476 \mathrm { t }$$

question 90

Multiple Choice

Give the focus, directrix, and axis for the parabola.
-A projectile is thrown upward so that its distance above the ground after t seconds is $$\mathrm { h } = - 14 \mathrm { t } ^ { 2 } + 476 \mathrm { t }$$ After how many seconds does it reach its maximum height?

• A) 28 sec
• B) 34 sec
• C) 17 sec
• D) 14 sec

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