Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 871351: If x is 3.5 then what is 16-2x

Click here to see answer by tommyt3rd(5050)

Question 867575: 2a^2=8a^2b^2
Solve the equation and find the value of variables a & b.
Click here to see answer by tommyt3rd(5050)

Question 871956: Please could someone help with the following:
Find y as a function of x given that d^2y/dx^2 = 6x - 4. (y=4 when x=1) and (y=2 when x=-1)
Please could you show and explain each step to help me understand the process.
Many Thanks
Click here to see answer by rothauserc(4718)

Question 871993: The area of the rectangle shown is 63 in^2. Find the length and width of the rectangle.
Below this there is a rectangle with the length as (x+8) and the width as (2x+5)
Click here to see answer by rothauserc(4718)

Question 871987: The sum of a number and 15 is 63. Find the number ?

Click here to see answer by lenny460(1073)

Question 871946: If x+2 is a factor of 2x^3+kx^2+16x, what is the value of k?
Click here to see answer by htmentor(1343)

Question 872110: Need help solving this equation and checking it to.
3/4(2/5x-3/7)-1/3x=2/7(1/3x-3)-(-2/5x-4/7)

Click here to see answer by Fombitz(32388)

Question 872138: Hi Can any one help me with a problem
Given the equation 3y=6x-2 , determine the slope and the y-intercept of this straight line.
No idea how to do this if some one can show and explain the workings for this question. Much appreciated
Merrilyn
Click here to see answer by josmiceli(19441)

Question 872252: 6 - 4(x + 3)
Click here to see answer by lenny460(1073)

Question 872298: Specify the missing term: a^2(_____ - 7) = 4a^3 - 7a^2

Click here to see answer by richwmiller(17219)

Question 872304: Solve for the unknown:
36 = t/1.5

Click here to see answer by jhunjiro(67)

Question 872296: Specify the missing term: 5xy(3x2y + 2) = 15x3y2 + _____
Click here to see answer by jhunjiro(67)

Question 872327: solve the equation by first changing each equation to a simpler, equivalent equation.
2/x+5 plus 3x/x^2+2x-15 equals 4/x-3
Click here to see answer by mananth(16946)

Question 872411: In electronics, according to Ohm's law, E = IR, where "E" is
voltage (measured in volts), "I" is current (measured in amps), and
"R" is resistance (measured in ohms).
Express the resistance, R, in terms of voltage "E" and current "I".
In other words, solve E = IR for "R" by treating "E" and "I" as
constants.

Click here to see answer by Alan3354(69443)

Question 872431: The length of a rectangle is 5 meters less than twice the width, and the area of the rectangle is 52 m^2 . Find the dimensions of the rectangle.
Click here to see answer by josgarithmetic(39617)

Question 872481: i have 2/x+2/3=1 i have to first find a common denominator for the 2/x and 2/3,yes?
so i came up with 3x...now i restate as 6/3x+2x/3x=1 6/3+2x/3x=1if i simplfy the first part,the fraction i get 4 but 4 doesnt equal 1..so i am doing something wrong..
Click here to see answer by ewatrrr(24785)

Question 872590: How do I show my work for this problem? I know the answer, I just don't understand how to get it, please help!
Zach took four biology tests and got scores of 83, 86, 91, and 77. He needs to complete one more test. If he wants to get an average of 85 on all five tests, what score does he need on his last test?
Click here to see answer by jim_thompson5910(35256)

Question 872626: Write an expression the means -9/2 times the time plus 80
Click here to see answer by Seutip(231)

Question 872638: mean of 15 nos is 5 if 2 is added to each no .what will be the new mean
Click here to see answer by indra89811(24)

Question 872638: mean of 15 nos is 5 if 2 is added to each no .what will be the new mean
Click here to see answer by MathTherapy(10552)

Question 872681: 4x�-9=0
Click here to see answer by Seutip(231)

Question 872680: 4x�-9x=0
Click here to see answer by Seutip(231)

Question 872621: Given: t = f�L, where "t" is torque, "f" is force, and "L" is length.
What force (in pounds) must be applied to an 0.8 ft long torque
rench to achieve the same torque generated by a 100 lb force
applied to an 0.5 ft long torque wrench?

Click here to see answer by indra89811(24)

Question 872619: Electronics, according to Ohm's law, E = IR, where "E" is
voltage (measured in volts), "I" is current (measured in amps), and
"R" is resistance (measured in ohms).
What is the voltage across an 8-ohm resistor with a current of 1.5
amps flowing through it?

Click here to see answer by indra89811(24)

Question 872623: Given: W1�x = W2(L - x), where W1 and W2 are weights on either side
of a balance bar, x is the distance from W1 to the
folcrum point, and "L" is the length of the balance bar.
What weight must be applied to the right end of an 8 foot long
balance bar (of negligible weight) to balance a 70 pound child on
the left end who is located 1 foot away from the fulcrum point?

Click here to see answer by KMST(5328)

Question 872712: How would you simplify 5s^2+7s + 6 = 0
Click here to see answer by josgarithmetic(39617)

Question 872733: if thrice of A's age 6 years ago be subtracted from twice of his present age result is equal to his present age.A's present age is
Click here to see answer by stanbon(75887)

Question 872738: Divided 56 into two parts such that three times the first part exceed one third of second by 48. The parts are
a. 25, 31
b.20,36
c.24, 32
Click here to see answer by stanbon(75887)

Question 872725: solve each equation.
A. 11b-11/5=3b-2/2

B. x/2-1/3=1/4+m/6
Click here to see answer by Alan3354(69443)

Question 872797: Solve each equation.
1. (11b-11)/(5)=(3b-2)/(2)

2. x/2-1/3=1/4+m/6
Click here to see answer by Seutip(231)

Question 872827: A local FedEx Office store has a press that can print 5,800 brochures per hour. How many can be printed during a 3 1/4 -hour run
Click here to see answer by stanbon(75887)

Question 872826: The Standard model sells for $235 and the Enhanced model sells for $305. If Yolanda sold a total of 11 units and took in $3,005, how many of the Enhanced model did she sell?
Do not enter units.
Click here to see answer by stanbon(75887)

Question 868366: Solve.
6/11x + 4 = 2/11x + 16
Click here to see answer by tommyt3rd(5050)

Question 872129: 5n^2 + 10n + 20=0
Click here to see answer by tommyt3rd(5050)

Question 871760: 2/3�275
Click here to see answer by tommyt3rd(5050)

Question 872849: My professor has taken the compound interest formula...

...and modified it to reflect annual investments. In this equation, C(t) is your cumulative sum, P is the amount invested ANNUALLY, for t years, interest rate of r (as a decimal), compounded n times per year:

Now, I have to solve THIS equation for t. I'm getting stumped when it comes down to logs and trying to isolate t.. this is the work I've come up to so far, please let me know if I'm messing anything up. If all is correct up to this point, I don't know how to finish it!

Like I said, assuming this is correct, I'm unsure how to follow up and finish. Can I divide by again, and then by n? Or vice versa? How does that affect the logs already on the other side? Please advise!
Click here to see answer by jim_thompson5910(35256)

Question 872885: need help learning how to factor. current problem is .
Click here to see answer by Alan3354(69443)

Question 872885: need help learning how to factor. current problem is .
Click here to see answer by richwmiller(17219)

Question 872976: What are the solutions of (3x)2 - 318 = 45?
Click here to see answer by Alan3354(69443)

Question 873075: Given: d = rt, where "d" is distance, "r" is rate, and "t" is time.
A plane flies a distance of 2,320 miles in 5.8 hours. What is its
average speed?

Click here to see answer by jim_thompson5910(35256)

Question 873119: A train traveling at 40 mph leaves for a certain town. One hour later, a bus
traveling at 50 mph leaves for the same town and arrives at
the same time as the train. If both the train and the bus travel in a straight line, how far is the town from where they started?
Click here to see answer by mananth(16946)

Question 873211: How can I solve this question? V=4π/3(a�-b�)

Click here to see answer by Karanm02(3)

Question 873218: V=4π/3(a�-b�)
How to solve this question? I really need help with this.
Click here to see answer by Fombitz(32388)

Question 873245: Find the equation of the line through the point (-3,5) with a slope of 2
Click here to see answer by oscargut(2103)

Question 873245: Find the equation of the line through the point (-3,5) with a slope of 2
Click here to see answer by Fombitz(32388)

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, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 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, 17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180, 18181..18225, 18226..18270, 18271..18315, 18316..18360, 18361..18405, 18406..18450, 18451..18495, 18496..18540, 18541..18585, 18586..18630, 18631..18675, 18676..18720, 18721..18765, 18766..18810, 18811..18855, 18856..18900, 18901..18945, 18946..18990, 18991..19035, 19036..19080, 19081..19125, 19126..19170, 19171..19215, 19216..19260, 19261..19305, 19306..19350, 19351..19395, 19396..19440, 19441..19485, 19486..19530, 19531..19575, 19576..19620, 19621..19665, 19666..19710, 19711..19755, 19756..19800, 19801..19845, 19846..19890, 19891..19935, 19936..19980, 19981..20025, 20026..20070, 20071..20115, 20116..20160, 20161..20205, 20206..20250, 20251..20295, 20296..20340, 20341..20385, 20386..20430, 20431..20475, 20476..20520, 20521..20565, 20566..20610, 20611..20655, 20656..20700, 20701..20745, 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