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)