大学数学微积分导数象限一元二次函数二元一次函数二元二次函数
- 格式:pdf
- 大小:261.67 KB
- 文档页数:7
MTH124PracticeExam1BusinessSectionsMTH124Name:Section:
AboutThisExam:
Thispracticeexamisdesignedtohelpyoupreparefortheupcomingexam.Thetypes
ofquestionsseeninthispracticeexamarerepresentativeofwhatyouwillseeonthe
actualexam.However,therecouldbecontentontheactualexamthatisnot
includedinthepracticeexam.
Youwillbenefitthemostfromthisexambytreatingitlikearealexam.Youshould
studyallthematerialbeforeattemptingtheexam.Whenyoudoattemptthepractice
examallowyourself50minutesandonlyyourcalculatorandawritingutensil.
Youwillbeexpectedtoshowallyourworkandprovidejustificationwherenecessaryon
theactualexam.
Disclaimer:ThispracticetestDOESNOTserveasanindicationof
thecontentsoftheactualtest.Itonlysuggestsapossibleformat.Page:234567Total
Points:35158151512100
Score:
1MTH124PracticeExam1BusinessSectionsMTH124
TrueorFalse
Answerthefollowingquestionsbychoosingtrueorfalseandclearlyfillinginexactlyonechoice.Nocreditwillbe
givenforchoicesnotclearlymarked.
1.(5points)Thederivativeofanyconstantfunctionis0.
TrueFalse
2.(5points)Giventhefunctionv(x),ifv(2)=3,thenv(x)mustbeincreasingoverthe
interval[2.9,3.1].
TrueFalse
3.(5points)Ifd(t)representsthedistanceacarhastraveledinmilesafterthours,then
d(t)representstheinstantaneousrateofchangeattimet.
TrueFalse
4.(5points)Therateofchangeofanexponentialfunctionisaconstantpercentchange.
TrueFalse
5.(5points)Asxincreasesto100,thevalueoff(x)=1/xbecomessmallerandsmaller.
Thismeansthatlimx→100f(x)=0.
TrueFalse
6.(5points)TherevenuefunctionRisgivenbythesumofanitemsprice,p,andthe
quantitysold,q.
TrueFalse
MultipleChoice
Answerthefollowingquestionsbychoosingasingleanswerandclearlymarkingthatchoice.Nocreditwillbegivenforchoicesnotclearlymarked.
7.(5points)ThefunctionA(t)=2.15(1.001)tmodelstheamountofmoneyinanaccount,
inmillionsdollars,wheretisyearssince2012.Whichofthefollowingistrue?
Accordingtothismodeltheaccountisgrowingataannualrateof100.1%.
Accordingtothismodeltheaccountisdecayingataannualrateof100.1%.
Accordingtothismodeltheaccountgrowingataannualrateof0.1%.
Accordingtothismodeltheaccountisdecayingatacontinuousrateof0.1%.
Accordingtothismodeltheaccountisgrowingatacontinuousrateof0.1%.
Accordingtothismodeltheaccountisgrowingatacontinuousrateof100.1%.
2MTH124PracticeExam1BusinessSectionsMTH124
8.(5points)Giventhefunctionf(x),whichofthefollowingcorrectlyinterpretsthemeaning
ofthestatement“f(x)>0forallvaluesofx”.
f(x)isincreasingoveritsentiredomain.
f(x)isincreasingoveritsentiredomain.
f(x)isdecreasingoveritsentiredomain.
f(x)isdecreasingoveritsentiredomain.
f(x)isbothincreasinganddecreasingoveritsentiredomain.
f(x)isbothincreasinganddecreasingoveritsentiredomain.
Noneoftheaboveanswersarecorrect.
9.(5points)ThefunctionP(t)providestheprofitofalargecorporation,inbillions,t
daysafterthestartoftheyear.Whichofthefollowingisthecorrectinterpretationof
limt→∞P(t)=5.6.
Atthestartoftheyearthecompanyhasaprofitof5.6billiondollars.
Thecompany’sprofitisgrowingatarateof5.6dollarsperday.
Astimegoesonthecompany’sprofiteventuallyapproaches5.6billiondollars.
Thecompany’sprofiteventuallyreaches5.6billiondollars.
Therateofthegrowthofcompany’sprofiteventuallyreaches5.6billiondollarsper
day.
10.(5points)Circletheplotbelowthatcorrectlyplotsthetangentlineoff(x)atx=4.
3MTH124PracticeExam1BusinessSectionsMTH124
ShortAnswer
Forthefollowingquestionshowallyourwork.Makesureyouranswersincludeanyrelevantunits.Nocreditwill
begivenforanswerswithouttheappropriateamountofworkshown.
11.Determineeachofthefollowinglimits,iftheyexist.Brieflyjustifyeachofyouranswers.
IfalimitdoesnotexistwriteDNE.
(a)(2points)limt→−2q(t)
(b)(6points)limh→0b(4+h)−b(4)
hwhereb(x)=2x+4.
4MTH124PracticeExam1BusinessSectionsMTH124
12.Salesofdigitalbooksincreasedrapidlyinlasttenyears.Theplotbelowgivesthesales
ofbooks,S(t),inmillions,tyearsafter2005.
(a)(4points)EstimateS(6).Clearlyshowyourwork.
(b)(4points)Explainwhatyouranswerfrompart(a)meansintermsofsalesofbooks
andtime.
13.(7points)Toproducekayaksasmallbusinesshasfixedcostsof$4,000,variablecostsof
$150,andwillselleachkayakfor$400.Determinetheminimumamountofkayaksthe
companyneedstoselltoearnaprofit.
5MTH124PracticeExam1BusinessSectionsMTH124
14.Bauertextileshiredaresearchcompanytoprovidesupplyanddemanddataforanew
product.Theresearchcompanyprovidedthefollowingfunctionswhicheachgivethe
quantityasafunctionofpriceindollars.D(p)=−2,000p+150,000S(p)=1200p
(a)(5points)Giventheinformationabovedeterminetheequilibriumprice.
(b)(5points)Atwhatpriceisthedemand100,000?
15.(5points)Usetheplotofg(x)tofilloutthetablebelow.Foreachvalueofxchoose
eitherincreasing,decreasing,orneitherforthebehaviorofg(x)atthatpoint.xg(x)(increasing,decreasing,orneither)
1
3
5
7
9
6