Questions on Algebra: Equations answered by real tutors!

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Question 208756: please help me solve the system of equations by graphing:
-3x+5-y
2y=6x+10
Thank you.
Click here to see answer by MathTherapy(10552)

Question 208889: A 2.00 kg sample of bituminous coal is composed of 1.30 kg of carbon, 0.20 kg of ash, 0.15 kg of water and 0.35 kg of volatile material. Using this information, determine how many kilograms of carbon are in 125 kg of coal.

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

Question 208930: The upper Angel Falls, the highest waterfall on Earth, are 750 m higher than Niagra Falls. if each of the falls were 7 m lower, the upper Angel Falls would be 16 times as high as Niaga falls. How high is each waterfall?
Click here to see answer by nyc_function(2741)

Question 208929: Johnny's lawn is 2/3 of an acre in size. if 7 1/2 bags of fertilizers are needed for a lawn that is 1 acre in size. How many bags will Johnny need to fertilize his lawn? Do we multiply, subtract or divide?
Click here to see answer by ankor@dixie-net.com(22740)

Question 208959: One of the first mixtures of metals, called amalgams, used by dentists for tooth fillings consisted of 26.0 grams of silver, 10.8 grams of tin, 2.4 grams of copper, and 0.8 grams of zinc.

How much silver is in a 25.0 gram sample of this analgam?

thank you
Click here to see answer by nerdybill(7384)

Question 208969: 5x-2x+7x=-81
I was having trouble with this problem is it 10x=-81, but they not divide what am i doing wrong
Click here to see answer by rapaljer(4671)

Question 208970: 6x/7=24/5

12-6x+3(2x+3)=2x+5 in this problem i worked in two ways not sure which is the right answer -8 or 13
Click here to see answer by rapaljer(4671)

Question 209012: please show the simple working for this problem .
1.9+m=16

Click here to see answer by rfer(16322)

Question 209064: 2[7-5(1-n)] + 8n = 16 + 3[6(n+1) + 3n]
Click here to see answer by RAY100(1637)

Question 209080: -2n+18=5n-24
Click here to see answer by RAY100(1637)

Question 209127: Solve the following system of equations:
2X+3Y=29
X=1.5Y=8
Are these not dependent?
Click here to see answer by Alan3354(69443)

Question 209073: -2n+18=5n-24
Click here to see answer by rfer(16322)

Question 209072: 8m-5=25-2m
Click here to see answer by rfer(16322)

Question 209134: 8n-13=13-8n
this is what i tried to do
8n-13=13-8n
+8n +8n
-13=13
Click here to see answer by checkley77(12844)

Question 209185: how do you solve this problem
24a-22=4(1-6a)
Click here to see answer by rapaljer(4671)

Question 209189: 14.00 millimeters equals how many meters?

Click here to see answer by Alan3354(69443)

Question 209189: 14.00 millimeters equals how many meters?

Click here to see answer by rapaljer(4671)

Question 209196: 1.0000 gigagrams equals how many nanograms? Please solve using scientific notation.

Click here to see answer by Alan3354(69443)

Question 209198: what is 0.121109 in scientific notation?
Click here to see answer by rfer(16322)

Question 209302: 7n-3=6(n+2)
Click here to see answer by stanbon(75887)

Question 209343: 2b+11=15-6b.....can i get a detailed explanation on how to do this problem & others like it, i would really appreciate it.
Click here to see answer by jim_thompson5910(35256)

Question 209351: ym(xm � xmy^2)
Click here to see answer by Alan3354(69443)

Question 209348: 4(-3x+1)=-10(x-4)-14x....please show the steps on how to do these types of problems.
Click here to see answer by jim_thompson5910(35256)

Question 209359: y + x = -7 Graph the equation and identify the y intercept
Click here to see answer by rfer(16322)

Question 209377: Adult tickets for a play cost $6.00, and children's tickets cost $2.50. For one performance, 370 tickets were sold. Receipts for the performance were $1723. Find the number of adult tickets sold.
Click here to see answer by stanbon(75887)

Question 209448: Perform the following multiplications.
3t*3t^6y^6*2y^4.
Simplify your answer as much as possible.
Click here to see answer by RAY100(1637)

Question 209453: Perform the following multiplications.
3t*3t^6y^6*2y^4.
Simplify your answer as much as possible.
Click here to see answer by RAY100(1637)

Question 209443: Perform the following multiplications.
3t*3t^6y^6*2y^4.
Simplify your answer as much as possible.
Click here to see answer by RAY100(1637)

Question 209438: i was assigned this word problem, can you help me solve it? please and thank you.
july 4th 1876, was america's 100th birthday. all members of the family decided to get together for a great family picnic.
when they started off for the picnic grounds, ever wagon they owned was pressed into service. each wagon carried the same number of people.
halfway to the grounds 10 wagons broke down, so it was necessary for the remaining wagons to carry one more person. when they started for home it was discovered that 15 more wagons were out of commission. so in the return trip there were three persons more in each wagon that when they started out in the morning.
the question is: how many people attended the great family picnic?
the paper give you a hint, it says: here's how you might start:
let x = number of people per wagon when they started.
let y = number of wagons when they started
write two equations with x and y, then solve the system. (you'll find that the "xy" terms cancel.)
Click here to see answer by stanbon(75887)

Question 209468: Suppose M is Between L and N. Use the Segment Addition Postulate to solve for the variable. Then find the lengths of LM MN and LN

LM= 3x+5

MN = 2x-5

LN = 23

please show all work. thank you
Click here to see answer by stanbon(75887)

Question 209011: please show the simple working for this problem .
1.9+m=16

Click here to see answer by checkley77(12844)

Question 209500: Find the lengths of the segments. Tell whether any of the segments have the same length and show all work.

E (1,4)

F(5,6)

G (5,1)
H (4,-4)

thank u
Click here to see answer by Alan3354(69443)

Question 208577: Hi, I was hoping to get some help with this problem......
The gravitational attraction between two masses varies inversely as the square of the distance between them. The force of attraction is 4 lbs when the masses are 3ft apart, What is the attraction when the masses are 6ft apart?
Thank you so much!!!
Click here to see answer by Theo(13342)

Question 208411: 3x+y=-8
-3x+4y=-2
Click here to see answer by Alan3354(69443)

Question 208536: 4(2k-1)=-10(k-5)
Click here to see answer by checkley77(12844)

Question 209605: w=gh-3gt^2; solve for g
Click here to see answer by Alan3354(69443)

Question 209613: -3/m+8/3=5/7
Click here to see answer by stanbon(75887)

Question 209771: 9-4(3x+1)=3(6-3x)-9
Click here to see answer by jim_thompson5910(35256)

Question 209761: Use the discriminant to determine whether the following equations have solutions that are: two different rational solutions; two different irrational solutions; exactly one rational solution; or two different imaginary solutions.
v2 - 6v - 2 = 0
A) Two different irrational solutions
B) Exactly one rational solution
C) Two different rational solutions
D) Two different imaginary solutions
Click here to see answer by jim_thompson5910(35256)

Question 209783: x-2/2 = m+n
Click here to see answer by nyc_function(2741)

Question 209782: S=2 times pie times r times h, for r
Click here to see answer by nyc_function(2741)

Question 209789: x-y+2z=1 x+2y+z=4 2x+y-z=5 find x y and z
Click here to see answer by silencehurts(5)

Question 209903: 14t + 20 = 8t - 22
Click here to see answer by Earlsdon(6294)

Question 209911: 8y-3=11y+9
Click here to see answer by nyc_function(2741)

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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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