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April 27th, 2009, 04:59 PM   #1
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height and feet???

The height y (in feet) of a ball thrown by a child is

y=(?1/16x2)+(2x+5) where x is the horizontal distance in feet from the point at which the ball is thrown.

(a) How high is the ball when it leaves the child's hand? (Hint: Find y when x=0.) feet =5

(b) What is the maximum height of the ball? feet =21

(c) How far from the child does the ball strike the ground? feet ????

cannot find C?/ I looked up it was 32 but not going through
chicagobearsconvulse is offline  
April 28th, 2009, 05:11 AM   #2
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Your answers are correct. For (c), put y = 0 and solve for x (using the quadratic formula); the answer you looked up is incorrect.
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feet, height

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