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

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

Question 348641:
Click here to see answer by ewatrrr(10682)

Question 348639:
Click here to see answer by nerdybill(6951)

Question 348639:
Click here to see answer by ewatrrr(10682)

Question 348714: Find the values of x that satisfy the following equations.
2(3x+5)=6x+11
Click here to see answer by Fombitz(13828)

Question 348760: Write an equation to find the number of feet given the number of yards(let f be the number of feet and y the number of yards).
Click here to see answer by ewatrrr(10682)

Question 348732: Find all the values of x that satisfy the following equations.
3(x+1)+1=3x+4
Click here to see answer by ewatrrr(10682)

Question 348719: Find the values of x that satisfy the following equations:
3(x+1)+1=3x+4
Click here to see answer by checkley77(12569)

Question 348801: I am doing a multi-step equation with variables on both sides. I tried as far as I could but am not sure if my next step will be correct. Here is the problem and my steps until I got stuck:
7-3r=r-4(2+r)
7-3r=r-8+4r

Thank you very much. As you can tell I used the distributive property but am not sure what to do now. One thing I know for certain is that my teacher said that our solution must be found by getting rid of the lowest valued variable first or else it is wrong, if that helps your solution. Thank you!
Click here to see answer by jim_thompson5910(28504)

Question 348780: 17-s
———= -10
4
Click here to see answer by checkley77(12569)

Question 348914: PV=nRI for r
Click here to see answer by Fombitz(13828)

Question 348933: Write the expresssion in reduced form. 9x^2+9x/2x+2
Click here to see answer by Fombitz(13828)

Question 348946: a=h(b1+b2)/2 for b1 my answer is b1= 2A/h-b2, please let me know if this is right thank you
Click here to see answer by edjones(7569)

Question 348954: what is c(210)=
Click here to see answer by edjones(7569)

Question 348637:
Click here to see answer by nyc_function(2733)

Question 348636:
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Question 349003: Perform the indicated operations and simplify. 2/x^2-4 subtracted by 1/x^2-3x+2 So first I feind the lowest common factor which is (x^2-4)(x^2-3x+2). Then I put 2/x^2-4 times x^2-3x+2/x^2-3x+2 subtracted by 1/x^2-3x+2 times x^2-4/x^2-4 ? Then what do I do?
Click here to see answer by mananth(12270)

Question 348643: Junior's boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of the current?
Click here to see answer by nyc_function(2733)

Question 349024: For the function f(x)=x + 12/x , find x when f(x)=8
So I know f(x)=8 is like y=8, and I'm trying to find x.
f(8)= x + 12/x
Now I'm lost. Should I be multiplying both sides of the equation by the reciprocal of 12/x?
Click here to see answer by jim_thompson5910(28504)

Question 348998: Perform the indicated operations and simplify. 6 minus 5/x+3 I know that you first find the lowest common denominator which in this case is x+3. I don't know what to do afterwards.
Click here to see answer by haileytucki(390)

Question 349054: The product of n and a number three less than n. I need to translate this into algebraic expression.
Click here to see answer by mananth(12270)

Question 349053: Write a number to represent the following situation: A gain of 5 yards. I need the Number then the Opposite. I don't understand what is wanted.
Click here to see answer by mananth(12270)

Question 349062: Find a two digit number such that the tens digit exceeds the unit digit by 3 and the number is 4 less than the sum of the squares of its digits.
Click here to see answer by mananth(12270)

Question 349061: Jeorge is 3 years older than his sister Janet.In 7 years she will be six-seven of his age.How old are they?
Click here to see answer by mananth(12270)

Question 349096: Can you tell me what, Half the product of a number and five, would be in algebraic expressions?
Click here to see answer by ankor@dixie-net.com(15639)

Question 348991: Perform the indicated operations and simplify. (x+5)(x-3)/x+2 times 1/(x+5)(x+2)
I multiplied right across and I got (x+5)(x-3)/8x^3+24x+20 I don't know if that's what I'm suppose to do.
Click here to see answer by ankor@dixie-net.com(15639)

Question 348807: How do I expand by Distributave Property? Here is the question.

mx(ab-b)
Click here to see answer by nyc_function(2733)

Question 349133: 43-8w=25-w

Click here to see answer by earmstrong620(4)

Question 348995: Perform the indicated operations and simplify. x+2/5(x-3) divided by x-2/5(x-3)
I know you keep change flip. x+2/5(x-3) times 5(x-3)/x-2 I don't know what to do afterwards
Click here to see answer by Fombitz(13828)

Question 349148: How do you work the problem... Y=x+8 and X+Y=2
Click here to see answer by Fombitz(13828)

Question 349174: Solve for the variable in each equation below. Show all your work. Provide a check for each answer. If a solution is undefined, state that in your answer.
7s-2/3 - 3s-16/6 =2
CHECK:
HELP ME PLEASE!
Click here to see answer by Fombitz(13828)

Question 349322: -7(3+2x) = 84
Im horrible at math and my teacher hates me.. :'( help.
Click here to see answer by josmiceli(9661)

Question 349363: S=L+2B;B
Click here to see answer by nyc_function(2733)

Question 349749: (2Y+5)+Y=-22
Click here to see answer by jim_thompson5910(28504)

Question 349803: If x-5=2, what is the value of 3x-5?

A fish tank contains 25 trout,20 bass, 15 perch, and no other kinds of fish. If one of theses fish is to be chosen at random, what is the possibility that the fish chose will be a trout?
if (x-3)(x+3)=a, then ( 2x-6)(x+3)=?
Which of the following could be represented by the expression 7-n/2?
Click here to see answer by nyc_function(2733)

Question 349823: y+2x=5 solve for y
Click here to see answer by Andrea Duran(1)

Question 349851: On the equation y+2x=5 I need to solve for y. I have came up with two differant answers. y=3x and y=5-2x. Do I subtract 5 minus 2x or leave it as is due to the variable?
Click here to see answer by Alan3354(30983)

Question 349891: how would i write a variable expression for "two fifths of a number"?
thanks,
serra
Click here to see answer by Fombitz(13828)

Question 349872: Please help me solve this equation for x: 3xa+5x=12
Click here to see answer by edjones(7569)

Question 349932: 4/49 = x^2
Click here to see answer by mananth(12270)

Question 349966: solving system if equations by substitution
1/2x+2y=12
x-2y=6
Click here to see answer by rfer(12652)

Question 349978: a cd cost $ 3.50 more than a tape
write an expresion for the total cost of i cd and 1 tape
Click here to see answer by jim_thompson5910(28504)

Question 349985: trying to help my son with his 6th grade math. writing algebraic expressions can you let me know if these are correct? 200 less than half of a number 1/2n-200 2nd problem the square of the product of 6 and a number (6xn)squared
Click here to see answer by jim_thompson5910(28504)

Question 350049:
Click here to see answer by mananth(12270)

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