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# A Function Word Problem!

Fri 24 Sep, 2010 07:04 pm
Winona deposited \$30 per week into her cookie jar. After 2 years she spent half of her savings on a stereo. After spending 6months on vacation she proceeded to spend \$15 per week on CDs until all of the money in the jar was gone. Graph the amount in her cookie jar as a function of time.

I'm not concerned about graphing it, I just have no idea how to set it up into an equation.
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contrex

1
Sat 25 Sep, 2010 12:15 am
@brokencdplayer,
brokencdplayer wrote:

I'm not concerned about graphing it, I just have no idea how to set it up into an equation.

Why do you need to do this? Can't you just prepare a table using -- dare I say it -- arithmetic?
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Brandon9000

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Sat 25 Sep, 2010 01:05 am
@brokencdplayer,
brokencdplayer wrote:

Winona deposited \$30 per week into her cookie jar. After 2 years she spent half of her savings on a stereo. After spending 6months on vacation she proceeded to spend \$15 per week on CDs until all of the money in the jar was gone. Graph the amount in her cookie jar as a function of time.

I'm not concerned about graphing it, I just have no idea how to set it up into an equation.

No equation beyond very simple ones is necessary. At the end of 2 years, she had \$30 x 104 = \$3120. She has the same amount for six months. Then she spends \$15 per week so that after \$3120/\$15 = 208 weeks she has zero.
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