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Constant vs Varying Change常数和不同的变化.ppt

Constant vs Varying Change常数和不同的变化.ppt

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时间：2021-04-24

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1、Constantvs.Varying ChangeConsiderthefollowing…Considerthefollowing…Anewpencilisplacedinanelectricsharpener.Studythefollowingchart.Doesthischartshowanincreaseoradecrease?#ofminutesinpencilsharpenerLengthofpencil (ininches)010½8161½4Astimegoesby,thelengthofthepencilisdecreasing

2、.#ofminutesinpencilsharpenerLengthofpencil (ininches)010½8161½4Minus2inchesMinus2inchesMinus2inchesIstherateofdecreaseconstantordoestheratevary?#ofminutesinpencilsharpenerLengthofpencil (ininches)010½8161½4Thisisaconstantrateofdecrease. Thepencilshrinksby2inchesevery½minute.#

3、ofminutesinpencilsharpenerLengthofpencil (ininches)010½8161½4Minus2inchesMinus2inchesMinus2inchesTime(inminutes)L e n g t h o f p e n c i l01234098765432110Howmuchtimemustpassbeforethepencilisgone?APencil’sChangingLengthInASharpenerTime(inminutes)L e n g t h o f p e n c i

4、 l0123098765432110EXTENDTHEGRAPH.After2½minutes,thepencilwillbegone.APencil’sChangingLengthInASharpenerConsiderthefollowing…Considerthefollowing…Jackputs$5intohispiggybankeveryweek.WeeksMoney (indollars)0015210315Studythefollowingchart.Doesthischartshowanincreaseoradecrease?W

5、eeksMoney (indollars)0015210315Astimegoesby,Jack’ssavingsisincreasing.Plus$5Plus$5Plus$5WeeksMoney (indollars)0015210315Istherateofincreaseconstantordoestheratevary?WeeksMoney (indollars)0015210315Thisisaconstantrateofincrease. Jackgains$5eachweek.Plus$5Plus$5Plus$5Time(inwee

6、ks)N u m b e r o f d o l l a r s0243504540353025201510550IfJackwantstohave$45inhispiggybank,forhowmanyweeksmusthesave?1Jack’sSavingsTime(inweeks)N u m b e r o f d o l l a r s02435045403530252015105501EXTENDTHEGRAPH.6789After9weeks,Jackwillhave$45.Jack’sSavingsConsiderthef

7、ollowing…Considerthefollowing…JohnworkstheconcessionstandatfootballgamesTimeHotdogSales5:00pm05:15pm75:30pm255:45pm30Studythefollowingchart.Doesthischartshowanincreaseoradecrease?TimeHotdogSales5:00pm05:15pm75:30pm255:45pm30Astimegoesby,thenumberofhotdogssoldisincreasing.Plus

8、7Plus18Plus5TimeHotdogSales5:00pm05:15pm75:30pm255:45pm30Istherateof

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