Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 174008: c^2-3c-10/c^2+5c-14 * c^2-c-2/c^2-2c-15
How do you find the illegal values in those fractions. The equation before the slash is the numerator.
Click here to see answer by Mathtut(3670)

Question 174016: 4-72+9n=-4
solve the equation.
Click here to see answer by Mathtut(3670)

Question 174034: -10=2(x-10)+6x
solve the equation.
Click here to see answer by checkley77(12844)

Question 174069: how do i figure out the x value (using substitution method) when the two equations given are y=2x and y=3x-2?
what are the steps i would take to figure it out?
Click here to see answer by Alan3354(69443)

Question 174144: can you solve the problems below

1. 5x+6(x-3)-9=18
2. 10-8a+9-3(a-9)+3=96
3. 9z-6+9=-3z
4. z-8+8-6=3z+9
5. 8t+9-8=33t+8-3
6. 9m+8-9+33=1359m+3-9
7. 6658w-6+3+1235=6352w+9-9
8. 3898r+8+3-100=965r-900
Click here to see answer by jim_thompson5910(35256)

Question 174161: (-5+5w+x)(-8) I got -40w-8x+40 Not sure. Could you help me? Thanks, Judy

Click here to see answer by nerdybill(7384)

Question 174161: (-5+5w+x)(-8) I got -40w-8x+40 Not sure. Could you help me? Thanks, Judy

Click here to see answer by ekerns(1)

Question 174160: -4*2+(1-2^)^ I worked this out and got -14. Could you help me with this? I think it is wrong, but am not sure. I do not know if I can check it. Thanks, Judy
Click here to see answer by stanbon(75887)

Question 174163: I thought I was getting the hang of this but the more math I try to do I think I get more confused. I have done this three times and got three different answers.0,-9 and 9
The problem is --- Find the value of 5z-9 given that -9z-9=9 thanks in advance. Judy
Click here to see answer by gonzo(654)

Question 174178: please help me on 4/5n = 20.
I got 1/2r= 3/8. i think it is r = 3
please tell me if im right
Click here to see answer by jim_thompson5910(35256)

Question 174209: divide
Solve
write as a single log
A radioactive isotope has a halflife of 600 years. If 50g is on hand now, how much will be available in 1000 years?

Click here to see answer by stanbon(75887)

Question 174233: Ok. I need to write an equation for the line y (4,0) x (3,7) I came up with y=-7x+28. Is that correct?Thanks, judy
Click here to see answer by nerdybill(7384)

Question 174359: Suppose that the credit remaining on a phone card (in dollars) is a linear function of the total calling time (in minutes). When graphed, the function gives a line with a slope of . See the figure below.
There is 29.16 in credit remaining on the card after 32 minutes of calls. How much credit was there after 24 minutes of calls?
Can somebody help me with this? I can't get the right answer and grapg it. TY judy

Click here to see answer by jim_thompson5910(35256)

Question 173159: please help me solve for Q
5+Q/40=845/Q+5+Q/80
Click here to see answer by nycsub_teacher(90)

Question 173135: 40DIVIVDED BY (4-5)EXPONENT2 TIMES NEGATIVE THREE
Click here to see answer by nycsub_teacher(90)

Question 174423: 23.5x + 3.25x +15.6 = 0
Click here to see answer by stanbon(75887)

Question 174522: Solve for X, Y, and Z in the following equations:
c. 22X + 5Y + 7Z = 12
10X + 3Y + 2Z = 5
9X + 2Y + 12Z = 14
I added all three to get 41x + 10y + 21z=31..then subtracted equation 2 from 1 to get 12x + 2y + 5z=7...then multiplied by 7 getting 84x + 14y + 35z=49...and now I'm stuck...any help would be appreciated:)

Click here to see answer by Alan3354(69443)

Question 174526: Solve by elimation

Click here to see answer by Edwin McCravy(20055)

Question 174548: Suppose you turn on a pump and let it run to empty the water out of a pool. The amount of water in the pool(W, measured in gallons) at any time (T, measured in hours) is given by the following equation: W=-350(T-4).
a) How many gallons of water are being pumped out each hour?
b) How much water was in the pool when the pumping started?
c) How long will it take for the pump to empty the pool completely?
d) Write an equation that is equivalent to W=-350(T-4). What does this second equation tell you about the situation?
e) Describe what the graph of the relationship between W and T looks like.
Click here to see answer by stanbon(75887)

Question 174570: The Student Council is going to buy equipment to make thingamajigs to sell to raise money for a school project. The equipment will cost $400, regardless of how many thingamajigs are produced. In addition to the initial equipment purchase, the Student Council will have a cost of $7 for each thingamajig. Write an equation for the total cost for producing x thingamajigs. How much will it cost to produce 80 thingamajigs?
Click here to see answer by nerdybill(7384)

Question 174605: Solve the system of equations using the substitution method.
If the answer is a unique solution, present it as an ordered pair: (x,y).
If not specify whether the answer is "no solution" or "Infinitely many solutions."
3x+y=7
4x-y=21
Click here to see answer by Mathtut(3670)

Question 174614: Rolex Smudgepot owns 17 ounces of gold. This is one ounce more than three fourths of the amount he owned last year?
Click here to see answer by checkley77(12844)

Question 174612: in a week Mike ran 8km farther than Bill, while Pete ran 1km less than 3 times as far as Bill. If Pete ran 15km farther than Mike, how many kilometers did Bill run
Click here to see answer by stanbon(75887)

Question 174691: Hi, i cant seem to solve (8/x)+(108/x^2)=96.88
^2 = squared
Can anybody help me with this please?
Click here to see answer by Alan3354(69443)

Question 174691: Hi, i cant seem to solve (8/x)+(108/x^2)=96.88
^2 = squared
Can anybody help me with this please?
Click here to see answer by stanbon(75887)

Question 174691: Hi, i cant seem to solve (8/x)+(108/x^2)=96.88
^2 = squared
Can anybody help me with this please?
Click here to see answer by jim_thompson5910(35256)

Question 174707: 1.Write the equation of a line with a slope of 2 if f(-1)=5.
2. For each equation describe the SHAPE of the graph:
a) x-2y=4
b) y=(x)(x)-4
c)y=the absolute value of x+4
d) y-2= -(x+2)
Click here to see answer by Alan3354(69443)

Question 174720: please solve the equation.
directions i was given:

solve the following equation for x.

thank you
Click here to see answer by Mathtut(3670)

Question 174720: please solve the equation.
directions i was given:

solve the following equation for x.

thank you
Click here to see answer by jim_thompson5910(35256)

Question 174721: please solve the equation.
directions i was given:
solve the following.

thank you
Click here to see answer by jim_thompson5910(35256)

Question 174721: please solve the equation.
directions i was given:
solve the following.

thank you
Click here to see answer by Mathtut(3670)

Question 174723: shoe sizes and foot length are related by the formula S = 3F - 24, where S represents the shoe size and F represents the length of the foot, in inches..
a) Solve the formula for F.
b) To the nearest tenth of an inch, how long is the foot of a person who wears a size 10 1/2 shoe?
Click here to see answer by Mathtut(3670)

Question 174759: 2n+5=
Click here to see answer by Mathtut(3670)

Question 174760: WHICH SEQUENCE FOLLOWS THE RULE 2N+5,WHERE N REPRESENTS THE POSITION OF A TERM IN THE SEQUENCE?
Click here to see answer by stanbon(75887)

Question 174810: 9-2k=25
Click here to see answer by stanbon(75887)

Question 174810: 9-2k=25
Click here to see answer by Alan3354(69443)

Question 174809: 15=-4p+7
Click here to see answer by stanbon(75887)

Question 174809: 15=-4p+7
Click here to see answer by RunningDave(1)

Question 174826: I'm not sure how to solve (x-20)+(x-40)+x=180
Click here to see answer by jim_thompson5910(35256)

Question 174879: 5A+4(3A-8)=4+13A

-X-(13+4X)=-3(5-9X)+2
Click here to see answer by jim_thompson5910(35256)

Question 174934: c-5 3
___ = __
c+4 2
This is a fraction c-5 over c+4 equals 3 over 2.
Click here to see answer by stanbon(75887)

Question 174986: 16x-8=
a. 8x
b. 8(2x-x)
c. 8(2x-1)
d. 8(2x-8)
Click here to see answer by jim_thompson5910(35256)

Question 174986: 16x-8=
a. 8x
b. 8(2x-x)
c. 8(2x-1)
d. 8(2x-8)
Click here to see answer by Alan3354(69443)

Question 174987: if 5(p-4) + 3 = 2p then p =
a. 1/3
b.5/3
c. 17/3
d. 6
I am very confused by this question and cannot find help in my textbook.. please help!
Click here to see answer by jim_thompson5910(35256)

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