Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 458116: Set up an equation and solve the following problem.
Find the length of a radius of a circle such that the circumference of the circle is numerically equal to the area of the circle.

Click here to see answer by richwmiller(17219)

Question 458137: Interest obtained after one year on an investment at 2 1/2% simple interest per year. x=number of dollars invested
Click here to see answer by stanbon(75887)

Question 458106: Perform the indicated division.
(3x^3 − 3x − 5) � (x + 2)
Click here to see answer by rfer(16322)

Question 458063: how can i convert 5MW used for 1 minute to kWh
Click here to see answer by josmiceli(19441)

Question 458105: Hal purchased a 200-minute calling card for $5.00. After he used all the minutes on that card, he purchased another card from the same company at a price of $13.75 for 550 minutes. Let y represent the cost of the card in dollars and x represent the number of minutes.
y=?
Click here to see answer by rfer(16322)

Question 458220: a cubic equation x3-216=0
Click here to see answer by stanbon(75887)

Question 458175: Please Help! How do you solve d=(1/2)at^2 for t in terms of a and d?
Click here to see answer by jim_thompson5910(35256)

Question 458231: Find the equation or inequality by clearing the fractions.
1. 1/3x-4<5/6
Click here to see answer by Alan3354(69443)

Question 458241: Please solve this and explain how its work? x-4=10
Click here to see answer by jim_thompson5910(35256)

Question 458113: A square piece of cardboard is 6 inches on a side. A square piece x inches on a side is cut out from each corner. The flaps are then turned up to form an open box. Find polynomials that represent the volume and outside surface area of the box.

Click here to see answer by ankor@dixie-net.com(22740)

Question 458265: 2x^2+x-3=0
My class assignment is to plot a grapgh using excel, but the main bit is trying to work out the the intersections of .
x=-3 and x=3. I need to plot some coordinates.
Click here to see answer by oberobic(2304)

Question 458288: If a average female math class has a weight of 125 and a height of 5'5" but Kelly has a height of 5'0" how much does she weigh
Click here to see answer by rfer(16322)

Question 458288: If a average female math class has a weight of 125 and a height of 5'5" but Kelly has a height of 5'0" how much does she weigh
Click here to see answer by Alan3354(69443)

Question 458368: 3(x-5)+1=x+4
Click here to see answer by robertb(5830)

Question 458392: A river flows at 2m/s. What is the speed throught the water of a boat that can go twice as fast doenstream as upstream?
please let me know the answer as I have no clue as to what it means... thanks!
Click here to see answer by edjones(8007)

Question 458374: can you please place this π(pi)in an algerbra number line and explain?
Click here to see answer by edjones(8007)

Question 458448: What is the center and radius of the circle: 4x^2+4y^2+48=640
for this equation, i divided all terms by 4. Therefore, leaving the equation with: x^2+y^2+12=160
Next, i brought the 12 to the other side of the = sign; thus, making the equation: x^2+y^2= 148
Now, we know that the equation of the circle is: (x+h)^2+(y+k)^2= r^2
since we can see from the equation: x^2+y^2=148
there is no h or k and therefore, the center of the circle is (0,0)
we know that the radius squared is 148 so in order to get the radius you need to square root the 148. therefore, the square root of 148 is 12.16552506
is there a mistake that i made with this equation? please let me know!
Click here to see answer by richwmiller(17219)

Question 458471:
If 3x - 2(4x + 5) = x + 2, then x =
A. -3
B. -2
C. 1/2
D. 4/3
Click here to see answer by rfer(16322)

Question 458442: what is the estimate
4 1/7x 56 =
what is the answer?
4&1/7 x 56 =
Click here to see answer by rfer(16322)

Question 458602: If 3ab =6 what is the value of a in terms of b
The answer the book have is 16 but I'm not to sure how to break the problem down
Click here to see answer by richwmiller(17219)

Question 458708: Please answer this question!!
4n over ab minus c over m equals x
or 4n/ab - c/m = x
Thanks!!!
Click here to see answer by Alan3354(69443)

Question 458743: please help me write an equation that represents the total cost c of an item costing x dollars. a salesperson needs to calculate the cost of an item with a sale tax of 8.25%.
Click here to see answer by algebrahouse.com(1659)

Question 458776: please help me solve this problem. if you purchase an item for business use, in preparing your income tax you may be able to spread out its expanse over the life of the item. this is called depreciation. one method of depreciation is straight-line depreciation, in which the annual depreciation is computed by dividing the cost of the item, less its estimated salvage value, by its useful life. suppose the cost is C dollars, the useful life is N years, and there is no salvage value. then the value V(in dollars) of the item at the end of years is given by: v=c(1-n/N).
if new office furniture is purchased for $3200, has a useful life of 8 years, and has no salvage value, after how many years will it have a value of $2000?
Click here to see answer by jim_thompson5910(35256)

Question 458799: Given that (x � 3y)^3 = 27, express x in terms of y.
Click here to see answer by robertb(5830)

Question 458824: The sum of four consecutive odd integers is -72 . Write an equation to model this situation, and find the values of the four integers.

Click here to see answer by stanbon(75887)

Question 458814: I need help doing algebra i keep messing up.
Click here to see answer by simranb(63)

Question 458841: solve for x: 1\x=(x+1)/6
Click here to see answer by MathLover1(20849)

Question 458840: 3x - 4 (2x - 3) - 10
Click here to see answer by algebrahouse.com(1659)

Question 458869: The variables x and y vary directly. Use
the given values to write an equation that relates x and y.
x = 5, y = 25
Help me!! Due friday help me slove this problem asap!!!
Click here to see answer by ankor@dixie-net.com(22740)

Question 459072: please explain how to solve the equation
5t-11-9t+6=19+8t
Click here to see answer by jim_thompson5910(35256)

Question 459088: Can someone help me with this.......
Solve by elimination
-7x+5y=-2
-3x-2y=8

Thank you so much for your help
Click here to see answer by Alan3354(69443)

Question 459120: Write the following as an radical expression.
v^(4/5)

Click here to see answer by MathLover1(20849)

Question 459173: Solve
Click here to see answer by math-vortex(648)

Question 459184: x+4/7>3
Click here to see answer by rfer(16322)

Question 459179: I am still not getting this can anyone help me with this?
solve by elimination method
-7x+5y=-20
-3x-2y=8
I know that I am to multiply the first equation by 2 and the second equation by 5 which would give me -14x+10y=-4 and -15x-10y=40. Then I am to add them which would give me -29x=36 but I don't know where to go from there. Can someone help me please, thank you so much
Click here to see answer by math-vortex(648)

Question 459189: Solve for d:

Click here to see answer by math-vortex(648)

Question 459094: The function g is defined below.
g(x)=((x)^(2)-9x+14)/((x)^2-11x+24)
Find all values of x that are NOT in the domain of g.
If there is more than one value, separate them with commas.
Click here to see answer by htmentor(1343)

Question 459226: What is the solution of 156x-500x+689=509 plz answer me. . !
Click here to see answer by jim_thompson5910(35256)

Question 459296: Which of the following relations are functions?
I. X 2,0,0,2
Y0,1,4,9
II. X 0,1,4,9
Y2,0,0,2
III. X-1,0,1,2
Y4,-2,-4,-8

A. II and III
B. I and III
C. III only
D. I only

Click here to see answer by richard1234(7193)

Question 459283: Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and Train A is traveling at 104 miles per hour. Train A passes a station at 2:25 PM. If train B passes the same station at 2:55 PM, at what time will Train B catch up to Train A?

Click here to see answer by htmentor(1343)

Question 459350: SOLVE FOR T: -2(-19T-3)=11T-4
Click here to see answer by edjones(8007)

Question 459383: I HAVE 2 SEPERATE SIMILAR QUESTIONS.

Question 1)Find the equation of the line which passes through the point (0,-5)and is parralel to y=8x-3
AND
Question 2) Find the equation of the line which is perpendicular to y=5x-7 and passes through the point (0, -2)

Thank You In Advance ! :)

Click here to see answer by sudhanshu_kmr(1152)

Question 459275: Pleasssse helpppppp!!!!!!.....Are the pair of lines parallel, perpendicular, or neither?
5x+4y=6
5x+4y=7

Click here to see answer by richard1234(7193)

Question 459526: WHAT EQUATION REPRESENTS six times the sum of a number and twelve is forty?
Click here to see answer by rfer(16322)

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, 27136..27180, 27181..27225, 27226..27270, 27271..27315, 27316..27360, 27361..27405, 27406..27450, 27451..27495, 27496..27540, 27541..27585, 27586..27630, 27631..27675, 27676..27720, 27721..27765, 27766..27810, 27811..27855, 27856..27900, 27901..27945, 27946..27990, 27991..28035, 28036..28080, 28081..28125, 28126..28170, 28171..28215, 28216..28260, 28261..28305, 28306..28350, 28351..28395, 28396..28440, 28441..28485, 28486..28530, 28531..28575, 28576..28620, 28621..28665, 28666..28710, 28711..28755, 28756..28800, 28801..28845, 28846..28890, 28891..28935, 28936..28980, 28981..29025, 29026..29070, 29071..29115, 29116..29160, 29161..29205, 29206..29250, 29251..29295, 29296..29340, 29341..29385, 29386..29430, 29431..29475, 29476..29520, 29521..29565, 29566..29610, 29611..29655, 29656..29700, 29701..29745, 29746..29790, 29791..29835, 29836..29880, 29881..29925, 29926..29970, 29971..30015, 30016..30060, 30061..30105, 30106..30150, 30151..30195, 30196..30240, 30241..30285, 30286..30330, 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