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【1.BenhasfourmorethantwiceasmanyCDsasJack.Iftheyhaveatotalof31CDs,howmanyCDsdoesJackhave2.JackwantstoreplacetheflooringinhisrectangularKitchen.Hecalculatestheareaofthefloortobe12.8squaremeters,Theactual】
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问题描述:

1.BenhasfourmorethantwiceasmanyCDsasJack.Iftheyhaveatotalof31CDs,howmanyCDsdoesJackhave

2.JackwantstoreplacetheflooringinhisrectangularKitchen.Hecalculatestheareaofthefloortobe12.8squaremeters,Theactualareaoftheflooris13.5squaremeters.Whatistherelativeerrorincalculatingtheareaofthefloor,tothenearestthousandth?

3.Arighttrianglecontainsa38°anglewhoseadjacentsidemeasures10centimeters.Whatisthelengthofthehypotenuse,tothenearesthundredthofacentimeter

4.Onthesetofaxesbelow,graphandlabeltheequationsy=|x|andy=3|x|fortheinterval-3小等于x小等于3.)

5.Onthesetofaxesbelow,solvethefollowingsystemofequationsgraphicallyandstatethecoordinatesofallpointsinthesolutionset.y=-x²+6x-3x+y=7.(要图)

彭实戈回答:
  都很简单的题目1.BenhasfourmorethantwiceasmanyCDsasJack.Iftheyhaveatotalof31CDs,howmanyCDsdoesJackhaveBen的CD是Jack的2倍还多4张,如果他们一共有31张CD,那问Jack有几张CD?x+2x+4=31...
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