Questions on Algebra: Equations answered by real tutors!

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Question 155854: Solve each equation.Check each solution.
23-2t=15-t
Click here to see answer by prabhjyot(164)

Question 155953: 0.3x-0.2y=4
0.2x+0.5y=-3

Click here to see answer by Electrified_Levi(103)

Question 156119: 3.5x + 24.2 > 60.5 - 8.6x
The solution is {x|x > __}
Click here to see answer by Fombitz(13828)

Question 156136: 7x-6
______ = 5. Please tell me how to work out X. Thanks, Emma xx
10
Click here to see answer by kdr(11)

Question 156136: 7x-6
______ = 5. Please tell me how to work out X. Thanks, Emma xx
10
Click here to see answer by checkley77(12569)

Question 156136: 7x-6
______ = 5. Please tell me how to work out X. Thanks, Emma xx
10
Click here to see answer by jim_thompson5910(28715)

Question 156138: (3a+2b)/2b= 7c/(n-t)

SOLVE FOR 'T'
Click here to see answer by jim_thompson5910(28715)

Question 156121: x/2 - 1 < 6/7
-
The solution is {x|x < __ }
-
Click here to see answer by oscargut(900)

Question 156118: 6x - 13 < -43
The solution is {x|x __ __}
Click here to see answer by dave41082(4)

Question 156112: how do you know when an equation has no solution
Click here to see answer by nabla(475)

Question 156113: how do you know when an equation has infinitely many solutions
Click here to see answer by nabla(475)

Question 156170: Hi, I need help
.
This is linear regression
.
I have these two lists
.
Let's say the left side is
.
Still heartbeat rate ! Racing heartbeat rate
... 50.......................... 166
... 60.......................... 168
... 70.......................... 170
... 80.......................... 172
.
I was told to use the first "x" as 0, and base the others on "0"
(For example, this is how you would write it in the calculator: 50 = 0, 60 = 10, 70 = 20, 80 = 30
.
If you put this in a calculator, using (0,10,20,30)as L1, (166,168,170,172) as L2
.
I get the regression line formula, of It has told me to predict
.
Still heartbeat rate ! Racing heartbeat rate
... 40.......................... ???
... 65.......................... ???
... 84.......................... ???
.
If I put in the numbers ( -10, 15, 34)(based on the first "50" = 0
.
Using the formula
.
(-10) = = = =
.
The other solutions are ( 169, and 172.8 )
.
Now, I found that if you just use the numbers themselves (50, 60, 70, 80) Instead of (0,10,20,30)
.
You come up with a different equation
.
The new equation = ( The book I got this problem from, has this answer/equation)
.
If I predict the same heart rates ( 40, 65, 84)
.
If I use the new equation
.
(40) = = = =
.
I get the same predictions, so which regression line is correct
.
(A)
.
(B)
.
Is it "A" or "B", my question is, "How do you know which regression line formula is correct?" It can be an infinite number of equations, depending on what you use for "L1"
.
Do you only use the First Number in list as "0" if it is a year?
.
Thanks ahead of time, Levi

Click here to see answer by stanbon(57967)

Question 156306: A cellular telephone company has two plans. Plan A charges $11 a month and $0.12 per minute. Plan B charges $20 a month and $0.10 per minute. After how much time, to the nearest minute, will the cost of Plan A be equal to the cost of Plan B? Please help, Thanks!
Click here to see answer by nerdybill(7003)

Question 156304: Given two lines whose equations are 3x+y-8 =0 and -2x+by+9 =0, determine the value of b such that the two lines will be perpendicular.
Please help!!!!!!!
Click here to see answer by nerdybill(7003)

Question 156319: 3x+(x+2)=10
Click here to see answer by orca(409)

Question 156269: I have a chart where I know the value of x. I am able to figure out y in my head, but can't seem to put in equation. x=1,2,3,4,5,6 then y=4,10,18,28,40,54. I need an equation. Thank you
Click here to see answer by oscargut(900)

Question 156347: 4b-3c?
b is 9
c is o,8
please help

Click here to see answer by oscargut(900)

Question 156321: hello, im a student in calculus
and i need help on some of the equation solving problems
here are two problems and please tell me the process
1) Find the equation of the line through (-2,5) perpendicular to the x-axis
2) Find the equation of the line through (-2,4) parallel to the y-axis
thank you for your time, i have a test tomorrow
and i will really appreciate your help
please reply back
thanks.
Click here to see answer by Alan3354(31518)

Question 153955: Could someone please help me with this problem.
write an equation for the following conditions: Passing through (-4,6) perpendicular to the line whose equation is Y= (-1/4)x+5 there are no parentheses around the -1/4
Thank You
Deb
Click here to see answer by Alan3354(31518)

Question 156303: A model rocket is launched from ground level. Its height, (h) meters above the ground, is a function of time (t) seconds after launch and is given by the equation h= -4.9t^2 + 68.6t. What would be the maximum height, to the nearest meter, attained by the model?
Click here to see answer by ankor@dixie-net.com(15746)

Question 156443: Solve for M:
A(M+N)=AB
Click here to see answer by jim_thompson5910(28715)

Question 156307: A box contains one 2-inch rod, one 3-inch rod, one 4-inch rod, and one 5-inch rod. What is the maximum number of different triangles that can be made using these rods as sides?
Click here to see answer by Edwin McCravy(8999)

Question 156463: how do u solve -2(x+4)+6=-3
Click here to see answer by jim_thompson5910(28715)

Question 156485: x(x-3)=x
Click here to see answer by Alan3354(31518)

Question 156484: what is the slope of the line whose equation is 3x-4y-16=0
Click here to see answer by Fombitz(13828)

Question 156588: How do you solve 4(m+3)=6m+8
Click here to see answer by atique.ah(26)

Question 156597: a/b=c/d, for a/c
Click here to see answer by jim_thompson5910(28715)

Question 156609: 2/3(7/8+4x)-5/8=3/8
Click here to see answer by nerdybill(7003)

Question 156647: Express the following rational expressions in lowest terms y^5-3y^3+8y^2 over 5y
Click here to see answer by stanbon(57967)

Question 156668: Add the following(z+3 over 2) +(7 over 2)
Click here to see answer by gonzo(654)

Question 156699: 1/2x-3/5=1/10+3/10
Click here to see answer by jim_thompson5910(28715)

Question 156705: 1/2x-3/5=1/10+3/10
Click here to see answer by jim_thompson5910(28715)

Question 156709: 4(n-3)=-16
-3(2n-2)=18
Click here to see answer by jim_thompson5910(28715)

Question 156710: 2+3(5x+7)=53
3n+2(n-4)= 42
3(x+2)= 15
Click here to see answer by jim_thompson5910(28715)

Question 156715: The sum of three consecutive even numbers is 150. Find the numbers.
Please help!
Thanks!
Click here to see answer by josmiceli(9817)

Question 156715: The sum of three consecutive even numbers is 150. Find the numbers.
Please help!
Thanks!
Click here to see answer by nerdybill(7003)

Question 156715: The sum of three consecutive even numbers is 150. Find the numbers.
Please help!
Thanks!
Click here to see answer by oscargut(900)

Question 156715: The sum of three consecutive even numbers is 150. Find the numbers.
Please help!
Thanks!
Click here to see answer by checkley77(12569)

Question 156715: The sum of three consecutive even numbers is 150. Find the numbers.
Please help!
Thanks!
Click here to see answer by jim_thompson5910(28715)

Question 156716: I need to find the length of one side of a triangle. If a triangle that has the second side 10 feet shorter than the first side. The third side is 50 feet longer than the first side. The perimeter is 684 feet. How long is the first side?
Click here to see answer by checkley77(12569)

Question 156719: -3(2n-2)= 18
Click here to see answer by jim_thompson5910(28715)

Question 156719: -3(2n-2)= 18
Click here to see answer by nerdybill(7003)

Question 156725: 0.51m+0.03=0.4m-0.74
Click here to see answer by jim_thompson5910(28715)

Question 154945: If ABC
+ DEF
= GHI
and
ADG
+BEH
=CFI
What numbers do you plug into this equation to make it correct both ways. IT says there are two answers.
Click here to see answer by Edwin McCravy(8999)

Question 156771: 4(3+x)+10=-11(x-6)+1 tryingto find the value of x. can't getthe hang of these negative numbers. seem to be missing a simple step. I know the answer is 3 but don.t know the steps to get there
Click here to see answer by Earlsdon(6294)

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