Tutors Answer Your Questions about Expressionswithvariables (FREE)
Question 994523: The family trip to Grandma's consisted of both a train ride and a car ride. The average speed of the train was 65 mph, the average speed of the car ride was 60 mph. The entire trip lasted 6 hours. Let x be the number of hours the train ride lasted. Write an expression for the total distance of the trip in miles.
Answer by macston(4006) (Show Source):
Question 994388: I need help with the Elimination method and the problem is 4x8y=8
ad 10x+8y=28
Found 2 solutions by Boreal, stanbon: Answer by Boreal(1464) (Show Source):
You can put this solution on YOUR website! 4x8y=8
10x+8y=28
========
Eliminate the y by adding the equations together. Notice that the 8y +8y=0, so the resulting equation will not have y. It will have been eliminated.
6x=36
x= 6
y:248y=8
8y=32
y= 4
=====
Check with second equation
10(4) + 8 (2)
4016=24
(6,4)
Answer by stanbon(69061) (Show Source):
You can put this solution on YOUR website! need help with the Elimination method and
the problem is 4x8y=8
and 10x+8y=28

Simplify the equations:
x  2y = 2
5x + 4y = 14

Multiply thru the top equation by 5 to get:
5x  10y = 10
5x + 4y = 14

Add the equations and solve for "y"::
6y = 24

y = 4

Solve for "x":
x  2y = 2
x  2*4 = 2
x + 8 = 2
x = 6

Cheers,
Stan H.

Question 994190: Solve the equation.
3.7 3.2X = 1.4X – 5.5
Answer by macston(4006) (Show Source):
Question 994170: p=√2t÷g
Answer by Alan3354(47455) (Show Source):
Question 994106: A number,half of that number,and one third of that number are added.the result is 222. What is the number?
Answer by ikleyn(988) (Show Source):
Question 994107: Ten less than double a number is the same as seven times the number. Find the number.
Answer by ikleyn(988) (Show Source):
You can put this solution on YOUR website! .
Ten less than double a number is the same as seven times the number. Find the number.

2x  10 = 7x
5x = 10,
x = 2.
Question 994109: (x2y)^3 for x=1 and y=3
Answer by ikleyn(988) (Show Source):
Question 993928: A space shuttle maneuvers so that it may capture an already orbiting satellite that is 6000km.ahead.If the satellite is moving at 27,000km/h and the shuttle is moving at 29,500km/h. How long will it take the shuttle to reach the satellite? (All digits are significant)
Answer by Alan3354(47455) (Show Source):
You can put this solution on YOUR website! A space shuttle maneuvers so that it may capture an already orbiting satellite that is 6000km.ahead.If the satellite is moving at 27,000km/h and the shuttle is moving at 29,500km/h. How long will it take the shuttle to reach the satellite?

It's 6000 km ahead
The shuttle is "gaining on it" at 2500 km/hr

6000/2500 = 2.4 hours
Question 993905: Solve the linear system using substitution.
4x  y = 5
4x + 4 = 4
Answer by ikleyn(988) (Show Source):
Question 993783: Twice the sum of a number x and 6
Found 2 solutions by jim_thompson5910, rfer: Answer by jim_thompson5910(33401) (Show Source):
You can put this solution on YOUR website!
Original Statement  Translation 

the sum of a number x and 6  x+6  Twice the sum of a number x and 6  2(x+6) 
Note: 2(x+6) is equivalent to 2x+12 when you distribute the 2 through
Answer by rfer(15570) (Show Source):
Question 993767: A=P(1+nr) Solve for r
Answer by MathLover1(11324) (Show Source):
Question 993768: P=a+b+c solve for a
Answer by MathLover1(11324) (Show Source):
Question 993735: How do I simplify 9((x+9)/5))5
Answer by Alan3354(47455) (Show Source):
Question 993712: The difference between high and low tides along the Maine coast in November is 19 feet on Monday and x feet on Tuesday.write an algebraic expression to show the average number of shows Mr.Hughes attended per year if he went to the theater for 31 years
Answer by Alan3354(47455) (Show Source):
You can put this solution on YOUR website! The difference between high and low tides along the Maine coast in November is 19 feet on Monday and x feet on Tuesday.write an algebraic expression to show the average number of shows Mr.Hughes attended per year if he went to the theater for 31 years

That's a tough one.
Question 993648: Solve by elimination method
3x5y=19
5x+3y=25
Found 2 solutions by Theo, Cromlix: Answer by Theo(5548) (Show Source):
You can put this solution on YOUR website! 3x5y=19
5x+3y=25
multiply the first equation by 5 and the second equation by 3.
3x  5y = 19 becomes 15x  25y = 95
5x + 3y = 25 becomes 15x + 9y = 75
your equations are now:
15x  25y = 95
15x + 9y = 75
subtract the first equation from the second equation to get:
34y = 170
divide both sides of this equation by 34 to get:
y = 5
go back to either one of your original equations and replace y with 5 and then solve for x.
your original equations are:
3x5y=19
5x+3y=25
take the first equation and replace y with 5.
the equation becomes:
3x  5*5 = 19
simplify to get:
3x  25 = 19
add 25 to both sides of the equation to get:
3x = 6
divide both sides of the equation by 2 to get:
x = 2
go back to your second original equation of 5x+3y=25 and replace x with 2 and replace y with 5 to get:
5x + 3y = 25 becomes 5*2 + 3*5 = 25 which becomes 10 + 15 = 25 which becomes 25 = 25.
this confirms the solution is correct.
Answer by Cromlix(3061) (Show Source):
You can put this solution on YOUR website! Hi there,
3x5y=19.....(1)
5x+3y=25......(2)
Multiply (1) by 3 and (2) by 5
9x  15y = 57.....(1)
25x + 15y = 125....(2)
Add (1) and (2)
34x.......= 68
x .......= 2
Substitute x = 2 into Equation(1)
3x  5y = 19
3(2)  5y = 19
6  5y = 19
5y ...= 25
y......= 5
]x = 2, y = 5]
Hope this helps :)
Question 993606: 5(2a3b)6(3a4b)=
Answer by MathLover1(11324) (Show Source):
Question 993378: s/2+1=1/4s6
what is the value of s
Answer by ikleyn(988) (Show Source):
Question 993198: 1) the length of a rectangle is 3in more than its width. The perimeter of the rectangle is 30in
Answer by MathLover1(11324) (Show Source):
Question 993120: R=1/r1+1/r2+1/r3 i need r2
Found 2 solutions by Alan3354, ikleyn: Answer by Alan3354(47455) (Show Source): Answer by ikleyn(988) (Show Source):
Question 993027: x + 4 and 2x  3 = ?
plsss answer
Answer by Fombitz(25151) (Show Source):
Question 992645: What is the answer ifa equals4 and b equals 7 and you have to evaluate the expression
Answer by farohw(153) (Show Source):
Question 992621: How to simplify (xy^3/y^3)^2
Answer by ikleyn(988) (Show Source):
Question 992356: Simplify expression 48x^5g^3/4x^3g^6
Answer by MathLover1(11324) (Show Source):
Question 992357: Simplify expression 4(2x^3y^4)^2
Answer by MathLover1(11324) (Show Source):
Question 992307: Hello all!,
I need clear S in next equation:
T=sqrt((RS)/S)
How I must do?,
Thanks in advance!
Answer by ankor@dixienet.com(18980) (Show Source):
Question 992227: need help on solution for this 4(1/2x+7)=12,have tried 12 on both sides but still unable to solve xthanks
Answer by stanbon(69061) (Show Source):
You can put this solution on YOUR website! need help on solution for this 4(1/2x+7)=12,have tried 12 on both sides but still unable to solve xthanks

4(1/2)x + 4*7 = 12

2x + 28 = 12

2x = 16

x = 8

Cheers,
Stan H.
Question 992191: Hi all,
I am sorry for my question, but I don't know how solve some equations.
I need isolate "s" in this problem:
P=f/2(1+sqrt(1+4s^2/f2))
Thanks in advance!
Answer by stanbon(69061) (Show Source):
You can put this solution on YOUR website! I need isolate "s" in this problem:
P=f/2(1+sqrt(1+4s^2/f^2))

2 = f[1+sqrt((f^2+4s^2)/f^2)]

2 = f[1+(1/f)sqrt(f^2+4s^2)]
====
2 = [f+sqrt(f^2+4s^2)]

2f = sqrt(f^2+4s^2)

44f+f^2 = f^2 + 4s^2

4s^2 = 44f

s^2 = 1  f

s = sqrt(1f)

Cheers,
Stan H.

Question 992090: x=25a/9b solve for b
Answer by solver91311(20879) (Show Source):
Question 991983: Hello,
I have next problem:
T=2Pi sqrt(K^2+h^2/gh)
and I have to isolate the variable K, some help please?
rookie78
Answer by Alan3354(47455) (Show Source):
Question 991567: 4(4w)=3(2w+2)
Answer by Fombitz(25151) (Show Source):
Question 991520: A student was asked to use the formula for the perimeter of a rectangle, P=2L+2w, to solve for L. The student came up with a n answer, P2w=2L. What error did the student make? Explain. Then solve for L.
Answer by josgarithmetic(13975) (Show Source):
You can put this solution on YOUR website! Student did not finish. He stopped at finding 2L, but he was assigned to solve for L. Missing step is multiplication property of equality, using the multiplicative inverse of 2.
Question 991513: The formula c=5p+215 relates c, the total cost in dollars of hosting a birthday party at a skating rink, to p, the number of people attending. If Allie's parents are willing to spend $300 for a party, how many people can attend?
Answer by solver91311(20879) (Show Source):
Question 991497: Please help..
Represent (or model) each situation with an algebraic equation.
The quotient of p divided by r, decreased by the product of p and r, is 5.
Answer by MathLover1(11324) (Show Source):
Question 991270: the perimeter of an equilateral triangle, whose side is x units, is thirty.
Answer by solver91311(20879) (Show Source):
You can put this solution on YOUR website!
So what is your question? Do you not understand what "perimeter" or "equilateral" means? What part of this question is giving you difficulty? What have you tried so far?
John
My calculator said it, I believe it, that settles it
Question 991235: In algebraic expression twice the difference between c and four
Answer by stanbon(69061) (Show Source):
You can put this solution on YOUR website! In algebraic expression twice the difference between c and four

Ans: 2(c4)

cheers,
Stan H.

Question 991153: you sold a used video game to a friend of yours for $18.00 less than the original cost.if you sold the video game to your friend for $35.00, what was the original cost of the game?
Answer by Alan3354(47455) (Show Source):
Question 991034: The factory produces b bicycle an hour and runs for h hours a day. Write a variable expression for the number of bicycle tires the factory uses each day. Evaluate the expression when b =50 and h =16
Answer by josmiceli(13716) (Show Source):
Question 990822: The sum of m and quotient of n divided by 2 .
Answer by ikleyn(988) (Show Source):
Question 990760: 9×^2 y^3/12xy^4
Answer by solver91311(20879) (Show Source):
Question 990589: Write an algebraic expression for the verbal description.
The perimeter of a rectangle with a width x and a length that is twice the width.
Answer by Timnewman(249) (Show Source):
You can put this solution on YOUR website! if width w=x(1)
and lenght L=2x(2)
Then
perimeter(P)=2(L+w)(3)
put equ 1 and 2 in 3
Therefore,
p=2(x+2x)
p=2(3x)
p=6x
HOPE THIS HELPS?
;;Timnewman::
Question 990511: 7 times a number increased by 10 is equal to 8 less than 4 times the number. Determine the number?
Answer by rantaw(1) (Show Source):

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
