Student Success Center Elementary Algebra Study Guide for the ACCUPLACER (CPT)

Transcription

1 Studet Success Ceter Elemetry Algebr Study Guide for the ACCUPLACER (CPT) The followig smple questios re similr to the formt d cotet of questios o the Accuplcer Elemetry Algebr test. Reviewig these smples will give you good ide of how the test works d just wht mthemticl topics you my wish to review before tkig the test itself. Our purposes i providig you with this iformtio re to id your memory d to help you do your best. I. Order of opertios 0. ( )( ).. 7. ( 7 ) () II. Scietific Nottio Write the followig i Scietific Nottio. Write i epded form. : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc : CED0-FC-C.doc

2 . 0,000, ,00,000,000,000,000, Simplify. Write swers i scietific ottio. 7.. III. ( 0 )( 0 ) ( 0 ) Substitutio Fid ech vlue if, y, d z.. yz z. y. ( y z) IV. Lier equtios i oe vrible Solve the followig for y (. 0 )( 0 ) z. y z ( ) 0 ( ) ( ) 0//00 : CED0-FC-C.doc

3 V. Formuls. Solve PV RT for T. y. Solve for y.. Solve y for.. Solve y h for.. Solve C πr for r. VI. Word Problems. Oe umber is more th twice other umber. The sum of the umbers is. Fid the umbers.. Ms. Joes ivested $,000 i two ccouts. Oe ccout pys % simple iterest d the other pys %. Her totl iterest for the yer ws $,0. How much did she hve i ech ccout?. How my liters of 0% solutio d % solutio must be mied to obti 0 liters of % solutio?. Sheil bought burgers d fries for her childre d some frieds. The burgers cost $.0 ech d the fries re $. ech. She bought totl of items, for totl cost of $.0. How my of ech did she buy? VII. Iequlities Solve d grph o the umber lie.. 7. ( ) <. VIII. Epoets & polyomils Simplify d write swers with positive epoets.. ( ) ( ). ( b c ). 7 ( b c ) 0. ( y z )( y z ). 7. ( )( 7) b c bc b c. ( ). ( 7 ). ( ) ( ) y z y z IX. Fctorig.. y y y.. 0//00 : CED0-FC-C.doc

4 X. Qudrtic Equtios ( ). 0. r r 0 XI Rtiol Epressios Perform the followig opertios d simplify where possible. If give equtio, solve for the vrible. y. y 7.. k k k 7. XII. Grphig Grph ech equtio o the coordite is.. y.. y. y. y. y 7. y 0//00 : CED0-FC-C.doc

5 XIII. Systems of Equtios Solve the followig systems of equtios.. y y. y 0 y. y y 7. y y XIV. Rdicls Simplify the followig usig the rules of rdicls (rtiolize deomitors). All vribles represet positive umbers.. ( 0).... y I. Order of Opertios ep oets Whe workig with,,,,,d Aswers, oe must remember the order of the opertios. First, prethesis or epoets s oe clcultes from left to right. Secod, multiplictio or divisio s oe clcultes from the left to right. Ad filly, dditio or subtrctio s oe clcultes from left to right. 0.. ( )( ) () //00 : CED0-FC-C.doc

6 II. Scietific Nottio power All umbers i scietific ottio hve the followig form: ozerodig it.restofumber 0.. 0,000, ,000,000,000,000,000,000, ,000,000. 0,00,000,000,000,000, ( 0 )( 0 ) 0 0 ( 0 ) ( 0 ) III.. yz.... y (. 0 )( 0 ) Substitutio z ( ) y () ( ) 0 ( y z) [ ] ( ) ( 0) 0 z () y ()( ) z ( ) 0 0 IV. Lier equtios i oe vrible.. ( ) ( ).. ( ) ( ) V. Formuls. PV RT PV PV RT T R RT R. y y y y y. C r π. y y. ( h ) y y h y h h h h 0//00 : CED0-FC-C.doc

7 VI. Word Problems. Let other umber forcig Oe umber. d 0. Oe umber d other umber 0.. Let the dollrs i the ccout pyig % iterest The,,000 the dollrs i the ccout pyig %. The iterest dollrs re clculted by multiplyig the totl dollrs i the ccout by the iterest rte. Hece:.0 the iterest ered by the first ccout.0 (,000 ) the iterest ered by the secod ccout. Addig up ll the iterest,.0.0(,000 ),0. Solvig, 7,00. So, Ms. Joes hs $7,00 i the ccout pyig % iterest d $0,00 i the ccout pyig % iterest.. Use the followig buckets: 0 % 0 - % 0 liters % From the digrm, we get the equtio:.. (0 ) 0(.) d the swer is liters t 0% d liters t %.. Let the umber of burgers d the umber of fries. To get the totl mout of moey spet, multiply the umber of items by the cost of the item..0 the totl dollrs spet o burgers d. ( ) the totl dollrs spet o fries. The equtio is:.0. ( ).0. Solvig the equtio,. Hece, she bought burgers d fries. VII. Iequlities Solve iequlities the sme s equtios with oe eceptio. Whe both sides re multiplied or divided by egtive umber, remember to switch the directio of the iequlity ( ) < -0 - < - - < > -. VIII. Epoets & Polyomils -. Add like terms: ( ) ( ). 0 0 b c ( b c ) b c b c 7 ( b c ) b c. 0 0 ( y z )( y z ) ( ) y y z z y z. 7 0 ( b c ) b c 0 b c 0//00 7: CED0-FC-C.doc b c ( ) 0 b c b c b c. bc b 0 0. ( y z) ( y z ) ( y z )( y z ) y z y z 7.. ( ) ( )( ) y z

8 IX. Fctorig Steps to fctorig:. Alwys fctor out the Gretest Commo Fctor (If possible).. Fctor the first d third term.. Figure out the middle term.. ( )( ). ( )( ). ( )( ), Differece of two squres. Sum of two squres requires the comple umber system to fctor. Not fctorble.. y ( y ) ( y )( y ) ( y)( y)( y ). Differece of two cubes: b ( b)( b b ) get : ( )( ) 7. ( y ) 7. X. Qudrtic Equtios. Let d b d use the formul to Steps:. Get zero o oe side of the equls. Fctor. Set ech fctor to zero. Solve for your vrible If you c ot fctor the equtio d the qudrtic is i the form b c 0, the use the qudrtic formul. b ± b c. 0 ( )( ) 0 0 or 0 or -., ( - )( ) 0 or.,. The solutio is give below: ( ) 0 ( - )( ) 0 or - 0. ± 0//00 : CED0-FC-C.doc

9 0//00 : CED0-FC-C.doc XI. Rtiol Epressios. Need to fid commo deomitor (fctor deomitors to see wht you eed), dd, d the reduce (if possible) t the very ed. 0. This problem uses the sme techique s bove. Be creful of the subtrctio. 0. To multiply frctios, fctor d ccel first before multiplyig.. Divisio is the sme process with oe etr step (ivert & multiply): c d b d c b. Oe other hit: (Cotiues o et pge). Fctor d Reduce to get.. Fid the Lowest commo deomitor (LCD) for ll frctios (y), the multiply the umertor d deomitor by the LCD. y y y y y y y y 7. Aihilte the deomitors by multiplyig both sides of the equtio by the LCD [ ], solve the resultig, frctioless equtio, d check swers i the origil equtio to isure tht the deomitors re ot zero. or Sice these swers do ot mke the deomitor zero i the origil equtio, they re the solutio.. k -. -

10 XII. Grphig. y -.. y. y. y. y 0//00 0: CED0-FC-C.doc

11 7. y XIII. Systems of Equtios The followig re dimesiol lier equtios. Ech equtio represets lie tht c be grphed o the coordite ple. The ultimte solutio to system of equtios is for the lies to itersect i o poit such s questio # d #. Questio # hs two equtios d oe is multiple of the other. Hece, both formuls grph the sme lie mkig the solutio ifiite. The lst possibility is i questio #. If you grph the lies i questio #, you will see tht they re prllel d do ot cross. This system hs o solutio.. The swer is d y. The work is below. y y y., y Multiply by - - y y Now, substitutig ito the first equtio XIV. Rdicls Thik of the ide ( ide outside. Also, remember these properties: ) s door perso. If it is two, the two ideticl fctors iside become oe b b b. ( )( 0 ) b y y y y y y y y y y. Worked out below ( ). ( )( ) //00 : CED0-FC-C.doc