Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

Tutors Answer Your Questions about Expressions-with-variables (FREE)

Question 422031: find the term independent of x in the expansion (2x-(1/x^2))^6
Click here to see answer by stanbon(57342)

Question 422148: I'd really appreciate some help with this problem, I've been stuck on it and I need help really soon.
y-3=x+2
Thanks!!!!!
:)
Click here to see answer by jim_thompson5910(28595)

Question 422179: I am working on the Zero Product Property
This problem is confusing. How do factor where I left off?
3x^2 + 16x = -5
3x^2 + 16x +5 = 0

Click here to see answer by mananth(12270)

Question 422233: Here is another problem that is giving me a hard time.
The perimeter of a triangle is 82 centimeters. The first side is 3 centimeters more than the second side. The third side is 1 centimeter less than twice the second side. Find the length of each side?
Please help me, step by step would be awesome.
Click here to see answer by solver91311(16885)

Question 422685: n+3=2n-1
Click here to see answer by rfer(12657)

Question 422685: n+3=2n-1
Click here to see answer by jim_thompson5910(28595)

Question 422808: could someone please help me to solve for a
b=12+a
Click here to see answer by stanbon(57342)

Question 422848: How do I know when an equation has no solution?
Click here to see answer by richard1234(5390)

Question 422885: Could someone please help me to use multiplying by 1 to find an expression equivalent to 7/15 with a denominator of 105c?
Click here to see answer by rapaljer(4667)

Question 422998: A=h/2(a+b)for h
Click here to see answer by jim_thompson5910(28595)

Question 423028: A=1+prt for r
Click here to see answer by jim_thompson5910(28595)

Question 423027: P=2l+2w for l
Click here to see answer by MathLover1(6632)

Question 423026: C= 5(f-32)divided by 9 for f
Click here to see answer by Alan3354(30993)

Question 423222: what is the solution for y=x-2 2x+2y=4
Click here to see answer by mananth(12270)

Question 423323: Hi I was hoping someone can help me out with this word problem please:
In a triangle, the measure of the first angle is twice the measure of the second angle. The measure of the third angle is 76 degrees more than the measure of the second angle. Use the fact that the sum of the measures of the three angles of a triangle is 180 degrees to find the measure of each angle.
Click here to see answer by sudhanshu_kmr(1152)

Question 423847: Could someone please help me solve this problem?
2(4y-8)>3(4y+5) the greater than sign has a line underneath it.
This problem says to use the set builder {yly_ _}

Click here to see answer by ewatrrr(10682)

Question 423971: how to solve y=1/2x+4
2y+2x=2
Click here to see answer by linht117(37)

Question 424110: Hi, I was wondering. How would this be solved I don't uderstand how to do this kind of problem
ex:
2(x+5) + 4(x-3) = x -6
Click here to see answer by Alan3354(30993)

Question 425094: -2x+3y+z=3
3x-y+2z=2
x+2y-3z=1
the answer they provided us is 13/21,25/21,2/3 i do not know how to get there..
Click here to see answer by Edwin McCravy(8909)

Question 425094: -2x+3y+z=3
3x-y+2z=2
x+2y-3z=1
the answer they provided us is 13/21,25/21,2/3 i do not know how to get there..
Click here to see answer by emargo19(101)

Question 425308: 6/8x=-2/4+4/4
Click here to see answer by rfer(12657)

Question 425367: I have an extra credit question on my homework that I have no clue how to solve. I just do not know where to start and am very confused. Any help would be marvelous : )
The problem is:
4a-3 = a+13 over a+1 (like a fraction)
I am just very stuck. Thank you! : )
Click here to see answer by Gersid(33)

Question 425444: the sum of 2 numbers is 48. if the larger number is 6 less than twice the smaller number, find the numbers.
Click here to see answer by ptaylor(2048)

Question 425453: a solution of 60 milliliters is 50% acid. how many milliliters of water must be added to create a 30% acid solution?
Click here to see answer by htmentor(789)

Question 425501: a motorcycle breaks down and the rider has to walk the rest of the way to work. motorcycle was going 45mph and the rider walks at a speed of 6mp/h. distance from home to work is 25 miles. total time for the trip was 2 hours. how far did the motorcycle go before it broke down?
Click here to see answer by ankor@dixie-net.com(15650)

Question 426002: Your math quiz had a total of 30 questions. You got 26 questions correct. What percent of the total questions did you get correct?
Click here to see answer by josmiceli(9676)

Question 426423: x-2y=3
4x-8y=12
Click here to see answer by linh117(31)

Question 426496: I can't come up with a suitable formula to solve this question please help.
In a certain number of hours, a woman travelled 36km. If she had travelled 1.5 km/h faster, it would have taken 3 hrs less to make the journey. how many kilometers did she travel per hour.
Click here to see answer by htmentor(789)

Question 426650: f(x)=-2(64)^x, find (5/3)
Click here to see answer by ewatrrr(10682)

Question 426986: What two factors multiply to equaul 72 but add up to be negative 18?
Click here to see answer by htmentor(789)

Question 427316: EVALUATE THE FOLLOWING EXPRESSION, SUBSTITUTING 0.35 FOR M.
8.1-M

0.35-8.1

Click here to see answer by Alan3354(30993)

Question 427606: if g+9=11,find the value of 7g
Click here to see answer by ewatrrr(10682)

Question 427851: Please help me solve this expression:
(x^6)/(x^9)
Click here to see answer by rfer(12657)

Question 427937: For what value of a is x=3 a solution to the equation x+3=ax+9.?
A. 1.5
B. 1
C. -1
D. -1.5
E. -3
Click here to see answer by algebrahouse.com(1079)

Question 427992: 5 (x -3) = 3(x +2)
Click here to see answer by rfer(12657)

Question 428063: I am supposed to solve using the substitution method.
5x-6y=-20
5x+45=y
Here is what I have tried and I think it is wrong.
I switched the 2nd equation so that it read y=5x+45.
It was then,
5x-6y=-20
y=5x+45
Here is how I worked it out
5x-6(5x+45)=-20
5x-30x-270=-20
-35x-270+270=-20+270
-35x=250 and I divided both sides by -35 and got 7.14 but I know this is wrong and I do not know where or what I did wrong.
Click here to see answer by Alan3354(30993)

Question 428159: Solve using the elimination method. Show all work.
4x + 8y = 16
-2x + 5y = 55
Click here to see answer by nerdybill(6958)

Question 428159: Solve using the elimination method. Show all work.
4x + 8y = 16
-2x + 5y = 55
Click here to see answer by Alan3354(30993)

Question 428161: Given the quadriatic function f(x) = x^2 - 14x + 49, find the value of x such that f(x) = 36
Click here to see answer by nerdybill(6958)

Question 428253: x-y=1
x+y=3
The instructions say: "Use elimination to solve each system of equations."
I have absolutely no clue what to do. I think you're supposed to somehow add the problem. Please help.
Click here to see answer by John10(245)

Question 428361: Give an equation of a line perpendicular to the line y = 4x
having the same y-intercept

Click here to see answer by Alan3354(30993)

Question 428609: Y varies directly as the square of R
If Y=162 and R=9
then find answer for Y, when R=7
Click here to see answer by htmentor(789)

Question 428718: x(x+6)=27 solve by factoring
Click here to see answer by nerdybill(6958)

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