Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 705605: Having a disagreement online. Does 6�2(1+2) = 9 or 1? Thanks
Click here to see answer by stanbon(75887)

Question 705678: i need help solving linear equations. How do i solve -1/2x+5(x-3)=x-1

Click here to see answer by geetha_rama(94)

Question 113878: How many grams of pure silver must be mixed with 450grams of an alloy that is 10% copper in order to produce a sterling silver that is 7.5% copper?
Click here to see answer by filboi(35)

Question 705778: (x/1)+[2/(x-1)]=3 Solve for x
Click here to see answer by stanbon(75887)

Question 705800: Explain the difference between a term and a factor. Use examples to support your explanations.

Click here to see answer by lynnlo(4176)

Question 705856: 9 - c = -13
Click here to see answer by lynnlo(4176)

Question 705704: hi
i have a qiestion about a formula:for measuring the sound intensity level why do we use log?
why don't we use sin or cos or anything else?
plz answer me
many thnx
Click here to see answer by ankor@dixie-net.com(22740)

Question 706079: can you help me solve this equation, please?
1/3x + 2/5 = 8
can you also include work so i can be able to see how you were able to get to the answer?
Click here to see answer by josgarithmetic(39617)

Question 706116: Hi. I'm having difficulty figuring out this problem. I've set it up but am not sure what to do after. Could you show me how to solve this problem from start to finish please? Thanks in advance!
Two car companies Elvis and Hearts rent cars. The Elvis car costs 30 dollars plus 20 cents per mile. The Hearts car costs 50 dollars with 50 free miles and then costs 15 cents per mile. On scratch paper graph the cost against distance driven for both companies.
(a) It is cheaper to rent from Elvis if you are driving less than _______ miles.
Click here to see answer by josgarithmetic(39617)

Question 706266: -9>-3(2x-2)>-27
Click here to see answer by jim_thompson5910(35256)

Question 706304: write an equation for the line 3x+6y=9 in the form y=mx+b
Click here to see answer by stanbon(75887)

Question 706154: A car radiator contains 30 quarts of 50% anti freeze. how many quarts should be drained and replaced with water so that the new solution is 30% antifreeze
Click here to see answer by ankor@dixie-net.com(22740)

Question 706301: write an equation for the line through the point (-6,-3) and parallel to the line y=2x-10 in point-slope form
Click here to see answer by mananth(16946)

Question 706434: x+y=5
x^x+y^y=31
Click here to see answer by Alan3354(69443)

Question 706432: hi i was wondering if you could help me with this question? it is a multiple choice answer question on algebra and problem solving however i am struggling to work out the correct answer.
the question reads:
in a maths exam with N questions, you score m marks for a correct answer to each of the first q questions and m+2 marks for a correct answer to each of the remaining questions. what is the maximum possible score?
the choices then read:
A (m+2)N-2q B Nm C mq+(m+2)q D n(m+1) E Nm+q(m+2)
i have tried replacing the numbers with letters however it hasnt really helped! thanks again!
Click here to see answer by ankor@dixie-net.com(22740)

Question 706460: Factorize completely
36p^2 + 6p

Click here to see answer by filboi(35)

Question 706460: Factorize completely
36p^2 + 6p

Click here to see answer by lynnlo(4176)

Question 706445: Express C in terms of F if F =9/5C+32
Click here to see answer by rfer(16322)

Question 706467: If length is twice its breadth. The area of the rectangle is 1800sq.m then find the length and breadth
Click here to see answer by god2012(113)

Question 706447: Rearrange the formula A=4pi r square to make r the subject
Click here to see answer by checkley79(3341)

Question 706547: I didn't know where to go for help. I took basic algebra years ago but don't really remember much. I'm trying to come up with an Excel formula that will find the value of X. I'm starting with X=(X/(Y*(Z/14)))/14. This is correct. I know I can simplify to 14X=X/(Y*(Z/14)) but then I don't know what to do with the X in the numerator. How do I get X to only one side of the equation?
Click here to see answer by jim_thompson5910(35256)

Question 706539: Find all the real solutions of the equation.
x^5+8x^2=0
Click here to see answer by jsmallt9(3758)

Question 706603: An executive in an engineering firm earns a monthly salary plus a Christmas bonus of $530. If she earns a total of $68,930 per year, what is her monthly salary?
Click here to see answer by rfer(16322)

Question 706601: What annual rate of interest would you have to earn on an investment of $5500 to ensure receiving $368.50 interest after 1 year?
Click here to see answer by rfer(16322)

Question 706597: A woman earns 10% more than her husband. Together they make $72,240 per year. What is the husband's annual salary?
Click here to see answer by rfer(16322)

Question 706565: what does x equal in 4x+8=2x+46
Click here to see answer by unlockmath(1688)

Question 706571: solve this equation 5x+9=3x+41
x=
Click here to see answer by lenny460(1073)

Question 706594:
An executive in an engineering firm earns a monthly salary plus a Christmas bonus of $680. If she earns a total of $61,880 per year, what is her monthly salary?
Click here to see answer by checkley79(3341)

Question 706733: Writing an algebraic expression.
"A 43 inch pipe is cute into 2 pieces. If 1 piece has a length of x inches, what is the length, in inches of the other piece?"
Is the answer as simple as
43-x=y or 43=x+y ??
thank you!
Click here to see answer by fcabanski(1391)

Question 706717: 2w+4(7+3w)=-14
Click here to see answer by jim_thompson5910(35256)

Question 706775: y-2/3=5
Click here to see answer by lynnlo(4176)

Question 706831: 9[(11+3)-4]
Click here to see answer by jim_thompson5910(35256)

Question 706802: please help me find the effective rate corresponding to the nominal rate of 5.47% compounded weekly.
when using weekly what will I be multiplying by?
i know that quarterly is by 4.
Click here to see answer by jim_thompson5910(35256)

Question 706866: Hi. I am having difficulty setting up this problem since there are many variables.
Here is the question:
A tourist travels 1500 miles using two planes. The second plane averages 50 miles per hour faster than the first plane. The tourist uses the slower plane for the first 500 and the faster plane for the next 1000 miles. The total flying time is 6.5 hours. What is the speed of the first plane?
Speed of first plane = ______ mph
Click here to see answer by josgarithmetic(39617)

Question 706992: Negative 6x plus 10 equals 82 what's the integer or simplified fraction?
Click here to see answer by stanbon(75887)

Question 706939: How do you find the missing value in this ordered pair using direct variation?
(4,y) and (16, 12)
Click here to see answer by ankor@dixie-net.com(22740)

Question 707044: We had this problem at school with no help in solving. I did it by trial and error but don't know the actual formula for solving.
The equation was: N(four digits)/D(one digit)=1234 r5.
Any help on how to solve for both N and D? Thanks!
Raphael
Click here to see answer by josgarithmetic(39617)

Question 707020: Please help me solve this equation 4/7x = -12
Click here to see answer by rfer(16322)

Question 706908: x=4
-4x-5x / 2
Click here to see answer by vheroli(126)

Question 707188: sqrt(3x+4) - sqrt (2x+4) =2
Click here to see answer by stanbon(75887)

Question 707126: Add
(2x^2-7x+63)+(3x^2+9x-63)
Click here to see answer by lynnlo(4176)

Question 707224: 3/x-5=10/x+2
Click here to see answer by jim_thompson5910(35256)

Question 707262: 3 1/5 + b = 6 1/10
b =
Click here to see answer by jim_thompson5910(35256)

Question 707262: 3 1/5 + b = 6 1/10
b =
Click here to see answer by lynnlo(4176)

Question 707265:

Y varies directly with x. If x=9 when y=5.4, find x when y=24.
Click here to see answer by checkley79(3341)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 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7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 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20746..20790, 20791..20835, 20836..20880, 20881..20925, 20926..20970, 20971..21015, 21016..21060, 21061..21105, 21106..21150, 21151..21195, 21196..21240, 21241..21285, 21286..21330, 21331..21375, 21376..21420, 21421..21465, 21466..21510, 21511..21555, 21556..21600, 21601..21645, 21646..21690, 21691..21735, 21736..21780, 21781..21825, 21826..21870, 21871..21915, 21916..21960, 21961..22005, 22006..22050, 22051..22095, 22096..22140, 22141..22185, 22186..22230, 22231..22275, 22276..22320, 22321..22365, 22366..22410, 22411..22455, 22456..22500, 22501..22545, 22546..22590, 22591..22635, 22636..22680, 22681..22725, 22726..22770, 22771..22815, 22816..22860, 22861..22905, 22906..22950, 22951..22995, 22996..23040, 23041..23085, 23086..23130, 23131..23175, 23176..23220, 23221..23265, 23266..23310, 23311..23355, 23356..23400, 23401..23445, 23446..23490, 23491..23535, 23536..23580, 23581..23625, 23626..23670, 23671..23715, 23716..23760, 23761..23805, 23806..23850, 23851..23895, 23896..23940, 23941..23985, 23986..24030, 24031..24075, 24076..24120, 24121..24165, 24166..24210, 24211..24255, 24256..24300, 24301..24345, 24346..24390, 24391..24435, 24436..24480, 24481..24525, 24526..24570, 24571..24615, 24616..24660, 24661..24705, 24706..24750, 24751..24795, 24796..24840, 24841..24885, 24886..24930, 24931..24975, 24976..25020, 25021..25065, 25066..25110, 25111..25155, 25156..25200, 25201..25245, 25246..25290, 25291..25335, 25336..25380, 25381..25425, 25426..25470, 25471..25515, 25516..25560, 25561..25605, 25606..25650, 25651..25695, 25696..25740, 25741..25785, 25786..25830, 25831..25875, 25876..25920, 25921..25965, 25966..26010, 26011..26055, 26056..26100, 26101..26145, 26146..26190, 26191..26235, 26236..26280, 26281..26325, 26326..26370, 26371..26415, 26416..26460, 26461..26505, 26506..26550, 26551..26595, 26596..26640, 26641..26685, 26686..26730, 26731..26775, 26776..26820, 26821..26865, 26866..26910, 26911..26955, 26956..27000, 27001..27045, 27046..27090, 27091..27135, 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30331..30375, 30376..30420, 30421..30465, 30466..30510, 30511..30555, 30556..30600, 30601..30645, 30646..30690, 30691..30735, 30736..30780, 30781..30825, 30826..30870, 30871..30915, 30916..30960, 30961..31005, 31006..31050, 31051..31095, 31096..31140, 31141..31185, 31186..31230, 31231..31275, 31276..31320, 31321..31365, 31366..31410, 31411..31455, 31456..31500, 31501..31545, 31546..31590, 31591..31635, 31636..31680, 31681..31725, 31726..31770, 31771..31815, 31816..31860, 31861..31905, 31906..31950, 31951..31995, 31996..32040, 32041..32085, 32086..32130, 32131..32175, 32176..32220, 32221..32265, 32266..32310, 32311..32355, 32356..32400, 32401..32445, 32446..32490, 32491..32535, 32536..32580, 32581..32625, 32626..32670, 32671..32715, 32716..32760, 32761..32805, 32806..32850, 32851..32895, 32896..32940, 32941..32985, 32986..33030, 33031..33075, 33076..33120, 33121..33165, 33166..33210, 33211..33255, 33256..33300, 33301..33345, 33346..33390, 33391..33435, 33436..33480, 33481..33525, 33526..33570, 33571..33615, 33616..33660, 33661..33705, 33706..33750, 33751..33795, 33796..33840, 33841..33885, 33886..33930, 33931..33975, 33976..34020, 34021..34065, 34066..34110, 34111..34155, 34156..34200, 34201..34245, 34246..34290, 34291..34335, 34336..34380, 34381..34425, 34426..34470, 34471..34515, 34516..34560, 34561..34605, 34606..34650, 34651..34695, 34696..34740, 34741..34785, 34786..34830, 34831..34875, 34876..34920, 34921..34965, 34966..35010, 35011..35055, 35056..35100, 35101..35145, 35146..35190, 35191..35235, 35236..35280, 35281..35325, 35326..35370, 35371..35415, 35416..35460, 35461..35505, 35506..35550, 35551..35595, 35596..35640, 35641..35685, 35686..35730, 35731..35775, 35776..35820, 35821..35865, 35866..35910, 35911..35955, 35956..36000, 36001..36045, 36046..36090, 36091..36135, 36136..36180, 36181..36225, 36226..36270, 36271..36315, 36316..36360, 36361..36405, 36406..36450, 36451..36495, 36496..36540, 36541..36585, 36586..36630, 36631..36675, 36676..36720, 36721..36765, 36766..36810, 36811..36855, 36856..36900, 36901..36945, 36946..36990, 36991..37035, 37036..37080, 37081..37125, 37126..37170, 37171..37215, 37216..37260, 37261..37305, 37306..37350, 37351..37395, 37396..37440, 37441..37485, 37486..37530, 37531..37575, 37576..37620, 37621..37665, 37666..37710, 37711..37755, 37756..37800, 37801..37845, 37846..37890, 37891..37935, 37936..37980, 37981..38025, 38026..38070, 38071..38115, 38116..38160, 38161..38205, 38206..38250, 38251..38295, 38296..38340, 38341..38385, 38386..38430, 38431..38475, 38476..38520, 38521..38565, 38566..38610, 38611..38655, 38656..38700, 38701..38745, 38746..38790, 38791..38835, 38836..38880, 38881..38925, 38926..38970, 38971..39015, 39016..39060, 39061..39105, 39106..39150, 39151..39195, 39196..39240, 39241..39285, 39286..39330, 39331..39375, 39376..39420, 39421..39465, 39466..39510, 39511..39555, 39556..39600, 39601..39645, 39646..39690, 39691..39735, 39736..39780, 39781..39825, 39826..39870, 39871..39915, 39916..39960, 39961..40005, 40006..40050, 40051..40095, 40096..40140, 40141..40185, 40186..40230, 40231..40275, 40276..40320, 40321..40365, 40366..40410, 40411..40455, 40456..40500, 40501..40545, 40546..40590, 40591..40635, 40636..40680, 40681..40725, 40726..40770, 40771..40815, 40816..40860, 40861..40905, 40906..40950, 40951..40995, 40996..41040, 41041..41085, 41086..41130, 41131..41175, 41176..41220, 41221..41265, 41266..41310, 41311..41355, 41356..41400, 41401..41445, 41446..41490, 41491..41535, 41536..41580