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January 30, 2015

January 30, 2015

Posted by **jennifer** on Thursday, September 25, 2008 at 9:56am.

I am not very good at them.

Any suggestions on how to set them up?

they vary from question to question

- MATH -
**drwls**, Thursday, September 25, 2008 at 11:40amTurn the word problems into equations, and solve for the unknown quantity or quantities.

Why not give us one or two examples to show you the process?

- MATH -
**jennifer**, Thursday, September 25, 2008 at 11:49amA model rocket is launched vertically upward from the top of a cliff 144 feet above sea level. This translates to the model y = -16t^2 + 128t + 144 where y is the height in feet and t is the time in seconds after it was launched. After it is launched, when will the rocket hit the water?

- MATH -
**drwls**, Thursday, September 25, 2008 at 11:57amIt will hit the water when y = 0. You have to solve the quadratic equation.

You can rewrite it (by dividing both sides by -16)

t^2 - 8t - 9 = 0

which factors to

(t-9)(t+1) = 0

Therefore t = 9 seconds is when it hits the ground. The other solution t = -1 second has no meaning

- MATH -
**Gloria**, Friday, July 9, 2010 at 12:28pmA ball is dropped from a height of 64 feet. It's height above the earth is the feet given by h(t)=-16t^2+64, where t is the number of seconds after it is dropped

a Find h(1)

b how long does it take the ball to fall to the earth

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