Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 125673: the formula m=0.3048 coverts length in feet f to length in meters m. a building that is 270 feet tall, is how tall in meters?
Click here to see answer by bucky(2189)

Question 125622: Find an equation for the line: through (1, 8) and perpendicular to y = 5/4x + 4
Click here to see answer by anne(47)

Question 125307: Ingrid can rake our lawn in 90 min ad I can do it in 60 min. If she rakes for 15 min before I join her, how long will it take us to finish? PLEASE HELP!!! The answer is 30 min, but I don't know how to get there. HELP IS MUCH APPRICIATED!!!!!!!!!
Click here to see answer by ankor@dixie-net.com(15624)

Question 125801: Write an equation of the line through the given points.
28. (1,5),(0,6)
Any help with this equation would be Greatly appreciated.
Click here to see answer by MathLover1(6614)

Question 125807: Hello I just wanted to make sure this answer was correct.
Write a true sentence using either < or >.
-1.2 ___ 0.333
My answer was -1.2 > 0.333
Click here to see answer by checkley71(8403)

Question 125829: Solve each of the following equations for x.

Click here to see answer by jim_thompson5910(28476)

Question 125884: Factor:

x^2+6x-16

Click here to see answer by jim_thompson5910(28476)

Question 125883: Factor:
x^2+5x+6

Click here to see answer by jim_thompson5910(28476)

Question 125882: Factor:

x^2+3x-18
Click here to see answer by jim_thompson5910(28476)

Question 125881: Factor:
x^2+7x+6
Click here to see answer by jim_thompson5910(28476)

Question 125974: 4x-16=80..This is from a test so I don't have a chapter or anything. I do not understand how to do this one or check my answer.
Click here to see answer by jim_thompson5910(28476)

Question 125973: 5x+8=3x-4= I think I got the right answer on the test. I wrote 6 as the answer but I got it 1/2 wrong because I don't know how to check my answer. I was wondering if you could help me figure out how to check my answer.
Click here to see answer by jim_thompson5910(28476)

Question 125994: How would you solve this equation?
2/3x-6-1/36=-3/4x-8
Click here to see answer by jim_thompson5910(28476)

Question 125997: How would you solve this equation?
6/5x-2/3x=-8/45
Click here to see answer by jim_thompson5910(28476)

Question 126005: Hi Can I have some help evaluating this function?
Use the function to evaluate the indicated expressions and simplify.
f(x) = -2x^2 + 7
f(x + 2) =
f(x) + f(2) =
Click here to see answer by jim_thompson5910(28476)

Question 126006: Hi Can I have some help with this problem?
According to the Theory of Relativity, the length L of an object is a function of its velocity v with respect to an observer. For an object whose length at rest is 25 m, the function is given below, where c is the speed of light.
L(v)=25 sqrt(1-(v^2)/(c^2))
(a) Find L(0.5c), L(0.8c), and L(0.84c).
L(0.5c) =
L(0.8c) =
L(0.84c)=

Click here to see answer by MathLover1(6614)

Question 126063: Hi I'm having trouble with this piecewise function. Can you help me?
Evaluate the piecewise defined function at the indicated values.
f(x)={(-5 if x<=3, x + 3 if x>3)
f(-4) =
f(0) =
f(3) =
f(4) =
f(6) =
Click here to see answer by marcsam823(57)

Question 126083: Can you please give me some insight on this problem, I don't know where to begin. Here goes: Substitute the given values into the formula and solve for the unknown variable.
V=one-third Bh; V=20; h=5
Click here to see answer by Earlsdon(6287)

Question 126109: Dear Tutor.
I have two questions. Can you , please help me ?
How to explain how equations come up with infinitely many solutions and no solution. Does having no solution mean that 0 is a solution?
Thank you.
Click here to see answer by stanbon(57220)

Question 126165: I need help on this. This is Math 209 the second half.
The problem to be solved is perform the indicated operation
3/x+1+2/x-1
Click here to see answer by stanbon(57220)

Question 126209: Can you please solve this problem for me.
2x/3+3/8=-1x/3-3/10 These are fractions, fractions are denoted by the forward slashes. Thanks in advance for your help.
Click here to see answer by edjones(7569)

Question 126225: Mr. Dee spent (in this order) 1/4 of his life in England, 1/3 in France, 7 years in Germany, half the remainder of his life in Russia and 1/2 as long in the U.S. as he had spent in France. If he was born in 1908, in what year did he die?
How would this be put into an equation ?
Solved it... by another method... 1992... but need to understand how to work the equation.
Thank you
Click here to see answer by uma(370)

Question 124779: how do i do this kinda stuff it confuses me
4d-5-9d+17

Click here to see answer by apachemexican1(64)

Question 126229: PLEASE HELP- A TRAIN LEAVES THE STATION AT 6PM GOING WEST AT 80 MI/. ON A PARRALLEL TRACK ANOTHER TRAIN LEAVES 3HRS LATER GOING 100 MI/H. AT WHAT TIME WILL THE 2ND TRAIN CATCH UP WITH THE FIRST TRAIN?
Click here to see answer by checkley71(8403)

Question 126231: PLEASE HELP ME- FRED BEGINS TO WALK TOWARDS JONS HOUSE AT 3 MI/H. JON LEAVES AT THE SAME TIME AND WALKS TOWARDS FREDS HOUSE ON THE SAME PATH AT 2 MI/H. HOW LONG WILL IT TAKE BEFORE THE TWO WILL MEET IF THE HOUSES ARE 4 MILES APART?
Click here to see answer by josmiceli(9649)

Question 126273: L+2=14
Y-1=91
18=4P
Click here to see answer by lauren_x3(3)

Question 126277: the number increased by 18 equal 60
Click here to see answer by lauren_x3(3)

Question 126277: the number increased by 18 equal 60
Click here to see answer by bucky(2189)

Question 126275: rediger statements to interpret formulas
5+n=25
6-p=2
10q=1000
89=h-2
34=2x
144=12y
45=9+m
Click here to see answer by solver91311(16868)

Question 126326: Hello,
I am trying to help my daughter with a math question that she doesn't understand. She lives in another state and gave me the problem over the phone. Math is one of my weaker subjects and her stepfather (who usually helps her) is out of town. The problem she gave me is as follows:
carbon 14 has 1/2 life of 5,730 years. after 17,190 years 1/8th of carbon 14 in a sample will be left. if 5 grams of carbon 14 are left after 17,190 years how much was in the original sample?
She said she is working on fraction equations.
Click here to see answer by solver91311(16868)

Question 126328: We are working on Rational Expressions and I am really confused. Can someone please help me with this crazy problem.
x^2-4/x^2-x-6 / (x^2-x-2/x^2-8x+15*x^2-3x-10/x^2+3x+2)
I have no idea where to start and the whole factoring thing has got confused! Thanks so much for the help!
Click here to see answer by stanbon(57220)

Question 126341: Hi Can I have some help with finding this function?
Find a function whose graph is the bottom half of the circle x^2 + y^2 = 25.
f(x) =
Click here to see answer by solver91311(16868)

Question 126356: Can you help me? I need to solve for y. The equation is 8/5y-2/3y=23-1/15y. I dont know how to do this...
Click here to see answer by solver91311(16868)

Question 126374: In a collection of dimes and quarters, there are seven more quarters than dimes. How many dimes and quarters are there if the collection is worth $3.50?
What is the equation for this?
Click here to see answer by solver91311(16868)

Question 126430: -2m+4=29-7m
Click here to see answer by apachemexican1(64)

Question 126429: -2m+4=29-7m
Click here to see answer by JessicaGill(40)

Question 126554:
1/2x + 1/4y = 4, solve for y
Click here to see answer by checkley71(8403)

Question 126556: one angle of a triangle has a measure that is 10 more than twice that of the second angle. the third angle has a measure 10 less than the first. find the measure of each angle of the triangle
Click here to see answer by checkley71(8403)

Question 126555: a student with a 1.875 gpa has 24 credit hours. find how many credit hours of b's (at 3 per credit hour) he will need to raise his gpa to a 2.40
Click here to see answer by ankor@dixie-net.com(15624)

Question 126618: I need to solve for C. Here is the equation:
9(2c + 5) + 3c = -75
Here is what I have done so far.
9 . 2c + 9.5 + 3c = -75
18c + 45 + 3c = -75
21c + 45 = -75
21c + 45 -45 = -75 + -75
I don't know where to go from here.
18c+45+3c=-75
- 3c -3c=-75
15c+45=-75
-45=-45
15c =-120
15 = 15 divide
c= -8
Click here to see answer by sable2you(1)

Question 126628: how do I solve for Y with 3x-2y=6?
Click here to see answer by solver91311(16868)

Question 126644: tan(11)=51/b How do i get b by itself?
Click here to see answer by ilana(307)

Question 126644: tan(11)=51/b How do i get b by itself?
Click here to see answer by marcsam823(57)

Question 126715: 3x-y<(less than/or equal to)6
x>(greater than or equal to)1
y(less than or equal to)3
changing the signs to equal signs I get
3x-y=6
y=6+3x
the two other equations confuse me as to where I go now
Click here to see answer by stanbon(57220)

Question 126766: Hi I'm having some trouble finishing this problem, can you help me? thanks
Between 1980 and 2000, a rare book collector purchased books for his collection at the rate of 46 books per year. Use this information to complete the following table. (Note that not every year is given in the table.)
Year Number of books
1980 450
1981 496
1982 542
1985 680
1990 910
1992 1002
1995 1140
1997 1232
1998 1278
1999 1324
2000 1370
Click here to see answer by checkley71(8403)

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