Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 603622: how do Iwork this problem? (0.95 - 0.68) x 6
Click here to see answer by Alan3354(30983)

Question 603839: Can you help my son work out 3i+1=-9
Click here to see answer by Alan3354(30983)

Question 603866: 1/x+1/y=1/z solve for x. I have seen the answer, x=yz/y-z. I need to know how the answer is derived.
Click here to see answer by scott8148(6628)

Question 603995: what is equation of a circle
Click here to see answer by scott8148(6628)

Question 604047: Write an equation which models how old in years each of you will be when you are 3 times as old as the younger person.
I am 27
Youngest is 11
I don't understand how to go about doing this equation wise.
Click here to see answer by georgiahammond(1)

Question 604073: Hi I need to ask a very important question, this is what my professor said about the answer
"Your answer is incorrect; you can multiply a number by itself 3 times and get a negative. Therefore, you do not get i"
I have done this over and over again, please help me out I have explained to her why I think I need to challenge her. Can anyone help???
Original question with answer below (I got answer from tutor on her and phone a program that I pay to use called www.Mathway.com)
Simplify -3√-1000
Tutor response:-3√-1000 then -3i√1000 which becomes -3(10)i√10 which is -30i√10
Mathway.com response”
-3√-1000
put all the perfect square roots out from under the radical, in this case remove 10i because it is a perfect square
(-3*10i*√10)
remove the parenthesis around the expression
-3*10i*√10
multiple the -30i by -30i
resulting in
-30i√10

Click here to see answer by mananth(12270)

Question 604124: f(x)=-6x^2+6x+12. How do i solve for x?
thanks!
Click here to see answer by jim_thompson5910(28504)

Question 604150: what is the anwser to n/3+5=7
Click here to see answer by jim_thompson5910(28504)

Question 604147: WHAT IS THE ANWSER TO N/3=5=7
Click here to see answer by Alan3354(30983)

Question 604173: what does -9x+7=3x+19 equal
Click here to see answer by rfer(12647)

Question 604125: Mitchell paid $94 for ten tickets to the concert. Adult tickets cost $15 each. Students tickets cost $8 each. How many of each kind of tickets did he buy?
Click here to see answer by mananth(12270)

Question 604144: given the equations: y= x^2-6x+10 y+x=4 what is the solution to the given system of equations
Click here to see answer by alicealc(281)

Question 604120: I need help with three math problems:

#1.) 4x^2 + 10x +6

#2.) x^2 - 5x+6 = 0

#3.) (6x + 2) (3x - 12) = 0

Thanks!
Click here to see answer by mananth(12270)

Question 604237: 4x+y=6 and 3x+2y=7 y=? and x=?
Click here to see answer by flame8855(424)

Question 604240: Solve the following system equations using the addition method: 3x-4y=8 and 2x+3y=9 y=? x=?
Click here to see answer by flame8855(424)

Question 604220: x is now twice as old as y. Four years ago x was three times as old as y was then. How old is x now?
Click here to see answer by flame8855(424)

Question 604261: X^2+2x-3=4
Click here to see answer by flame8855(424)

Question 604293: [(x^2+x+2)/(x^2+4x+3)]/[(x+2)/(x+3)]. The "Compass" book by Callahan says the answer to this when simplified is 1. I don't see how that is possible. Can you show me the steps?
Click here to see answer by flame8855(424)

Question 604318: |2x-8|-12=8
Click here to see answer by lawdej(58)

Question 604337: I need to write an equation from this series of data and I am confused. Below is my data:
Years Male Female
0 40.656 24.137
5 42.493 24.994
10 43.360 26.085
15 43.236 27.920
20 41.391 29.643
25 41.375 29.554
30 43.615 32.153
35 42.743 32.903
36 42.261 32.515
PLease help in a detailed way on how to come about writing an equation for this data to solve to see when the median female earnings will meet the median male earnings.
Click here to see answer by KMST(1868)

Question 604542: lisa can sweep the paths around her home in 30 minutes. Her sister Tania takes 20 minutes to do the same job. If they work together, how long will it take to complete the job?
Click here to see answer by nerdybill(6951)

Question 604611: how you get the sum of all the whole natural numbers greater than 89 and less than 101
Click here to see answer by Edwin McCravy(8882)

Question 604620: Please help...I don't get this at all :)
Find the Solution Set for the equation:
(1/27)^(2x-3)=81^(x+1)

Click here to see answer by jim_thompson5910(28504)

Question 604541: there are 12 boys and 12 girls in a science class. if 6 boys can read 6 science journals in 6 weeks and 4 girls can read 4 science journals in 4 weeks, how many science journals can the entire class read in 12 weeks?
Click here to see answer by ankor@dixie-net.com(15638)

Question 604787: Solve equations by factoring
Principle of zero products
Application problems
Number Sense: The sum of two number is six. The sum of the squares of the two numbers is twenty. Find the two numbers.
a + b = 6
a^2 + b^2 = 20
Don't know if I set it up right and what to do next.
Click here to see answer by lwsshak3(6472)

Question 604764: Can someone tell me what to do with this problem? Thanks for your help!
Add. Simplify; if possible.
4c/5c-10 + 5c/10c-20

Click here to see answer by alicealc(281)

Question 604785: Solve equations by factoring
Principle of zero products
Application problems
Number Sense: The square of a positive number is six more than five times the positive number. Find the number
x^2 + 5x + 6 is how I set it up
(x+2)(x+3)= 0
x+2=0
x = -2
x+3=0
x = -3
The book gives an answer of 6
Click here to see answer by lwsshak3(6472)

Question 604820: ((2 * 2) + 2 - 2) / 2
Click here to see answer by alicealc(281)

Question 604838: factor by grouping
4z^2+8z-az-2a
factor the trinomial
2s^2-9s+9
factor
r^2-64

Click here to see answer by alicealc(281)

Question 602893: 10(2x – 3) – 2(3x + 4) = 4(x – 1) + 16
Click here to see answer by jim_thompson5910(28504)

Question 602891: 5(2x + 4) – 3(2x – 4) = 2x + 10
Click here to see answer by jim_thompson5910(28504)

Question 604948: Find the equation of the line passing through (3,5) perpendicular to the line 5x-3y=18
Click here to see answer by scott8148(6628)

Question 605060: What is the answer of this eqution 11 + x > 390

Click here to see answer by Math-Genius(4)

Question 605040: 3(x-2)-1=6(x+5)

Click here to see answer by rfer(12647)

Question 605119: What is the expression of "3n over n-5 + 3 over 5-n" I am not sure on what process to use
Click here to see answer by stanbon(57246)

Question 605178: how many bills are there in $ 6590?
pls let me know what is logic used
Eg $10=4bills
$50= 1 bill
Click here to see answer by Alan3354(30983)

Question 605196: Please help solve (s) on the following equation (144/s)+2=144/(s-6)
Click here to see answer by lwsshak3(6472)

Question 605319: solve 9x²=1
Click here to see answer by jim_thompson5910(28504)

Question 605414: 16d^2+36d+18=0
Click here to see answer by jim_thompson5910(28504)

Question 605422: Solve the system of equations
-x + 6y = -6
3x − 29y = 28
x =
y =
Click here to see answer by stanbon(57246)

Question 605421: Solve the system of equations
-6x − y = 1
7x + y = 0
x=
y=
Click here to see answer by stanbon(57246)

Question 605424: Write the standard form of one equation of the line with slope -3 passing through (-1,-6)
Click here to see answer by jim_thompson5910(28504)

Question 605829: Please help!
Find the value of p and q such that:
1/(√5-2)=p+q√5

thank you !!
Click here to see answer by josmiceli(9661)

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