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

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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.

󰀂True󰀂False

2.(5points)Giventhefunctionv(x),ifv󰀃(2)=3,thenv(x)mustbeincreasingoverthe

interval[2.9,3.1].

󰀂True󰀂False

3.(5points)Ifd(t)representsthedistanceacarhastraveledinmilesafterthours,then

d󰀃(t)representstheinstantaneousrateofchangeattimet.

󰀂True󰀂False

4.(5points)Therateofchangeofanexponentialfunctionisaconstantpercentchange.

󰀂True󰀂False

5.(5points)Asxincreasesto100,thevalueoff(x)=1/xbecomessmallerandsmaller.

Thismeansthatlimx→100f(x)=0.

󰀂True󰀂False

6.(5points)TherevenuefunctionRisgivenbythesumofanitemsprice,p,andthe

quantitysold,q.

󰀂True󰀂False

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