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1、21.y=2x+7x–3xy2.Thefigureaboveshowsthegraphofafunctionf,definedbyf(x)=
2、2x
3、+4forallnumbersx.Forwhichofthefollowingfunctionsgdefinedforallnumbersxdoesthegraphofgintersectthegraphoff?Ag(x)x–2Bg(x)x3Cg(x)2x–2Dg(x)2x3Eg(x)3x–23.Eachemployeeofacertaincompanyisineither
4、DepartmentXorDepartmentY,andtherearemorethantwiceasmanyemployeesinDepartmentXasinDepartmentY.Theaverage(arithmeticmean)salaryis$25,000fortheemployeesinDepartmentXandis$35,000fortheemployeesinDepartmentY.Whichofthefollowingamountscouldbetheaveragesalaryforalloftheemploy
5、eesinthecompany?Indicateallsuchamounts.A$26,000B$28,000C$29,000D$30,000E$31,000F$32,000G$34,0004.Workingaloneatitsconstantrate,machineAproduceskcarpartsin10minutes.Workingaloneatitsconstantrate,machineBproduceskcarpartsin15minutes.HowmanyminutesdoesittakemachinesAandB,
6、workingsimultaneouslyattheirrespectiveconstantrates,toproducekcarparts?____________minutes5.1)IfthedollaramountofsalesatStorePwas$800,000for2006,whatwasthedollaramountofsalesatthatstorefor2008?A$727,200B$792,000C$800,000D$880,000E$968,0002)AtStoreT,thedollaramountofsal
7、esfor2007waswhatpercentofthedollaramountofsalesfor2008?Giveyouranswertothenearest0.1percent.___________%3)Whichofthefollowingstatementsmustbetrue?Indicateallsuchstatements.AFor2008thedollaramountofsalesatStoreRwasgreaterthanthatateachoftheotherfourstores.BThedollaramou
8、ntofsalesatStoreSfor2008was22percentlessthanthatfor2006.CThedollaramountofsalesatStoreRfor2008wasmorethan17percentgreaterthanthatfor2006.6.Acertainstoresellstwotypesofpens:onetypefor$2perpenandtheothertypefor$3perpen.Ifacustomercanspendupto$25tobuypensatthestoreandther
9、eisnosalestax,whatisthegreatestnumberofpensthecustomercanbuy?A9B10C11D12E207.Alistofnumbershasameanof8andastandarddeviationof2.5.Ifxisanumberinthelistthatis2standarddeviationsabovethemean,whatisthevalueofx?x=______8.FrequencyDistributionforListXNumber1235Frequency10201
10、812FrequencyDistributionforListYNumber6789Frequency2417109ListXandlistYeachcontain60numbers.Frequencydistributionsfor
