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

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 Algebra: Expressions involving variables, substitution Solvers Lessons Answers archive Quiz In Depth

 Question 178200: Simplify x-4/2x^2-3x-2 - 3/2x+1 Click here to see answer by Alan3354(31530)

 Question 178216: Please, I need your help...I do not understand how to solve this problem w1/w2 = f2-f/f-f1 solving for w1 Click here to see answer by stanbon(57967)
 Question 178216: Please, I need your help...I do not understand how to solve this problem w1/w2 = f2-f/f-f1 solving for w1 Click here to see answer by solver91311(17077)

 Question 178222: 72.) Solve 3/x – 1/6 = 1/x 93) Solve x + 5 = 6/x Click here to see answer by stanbon(57967)
 Question 178222: 72.) Solve 3/x – 1/6 = 1/x 93) Solve x + 5 = 6/x Click here to see answer by solver91311(17077)

 Question 178261: I think of a number halve it and subtract 1 from it. The result is double the amount obtained by dividing the number by 3 and subtracting 4 from it. Find the number ? Click here to see answer by EMStelley(187)

 Question 178295: 5/2x + 1/4x = 9/4 + x ( this one I just gave up on, could not for the life of me even come close to the right answer) Please help. Thank you! Click here to see answer by jim_thompson5910(28715)

 Question 178231: 13) Solve 2/(x – 3) = 4/(x + 3) + 8/(x2 – 9) 14) Solve 13/(y – 1) – 3 = 1/(y – 1) 15) Solve (x + 3)/(x –1) = (x + 2)/(x – 3) thanks thanks thanks!!! Click here to see answer by ankor@dixie-net.com(15746)

 Question 178308: Train A and B are traveling in the same direction on parrallel tracks. Train A at 80 miles per hour and train B at 90 miles per hour. Train A passes a station at 7:20pm. If train B passes the same station at 7:32pm, at what time will train B catch up to train A? My answer would be N, not defined becuase they are travling at different speeds. However, train B is going faster than train A. If I had to guess, I would say 8:43pm I'm confused, please help me. Thank you for your help! Click here to see answer by ptaylor(2052)
 Question 178308: Train A and B are traveling in the same direction on parrallel tracks. Train A at 80 miles per hour and train B at 90 miles per hour. Train A passes a station at 7:20pm. If train B passes the same station at 7:32pm, at what time will train B catch up to train A? My answer would be N, not defined becuase they are travling at different speeds. However, train B is going faster than train A. If I had to guess, I would say 8:43pm I'm confused, please help me. Thank you for your help! Click here to see answer by josmiceli(9817)

 Question 178334: What values of x are excluded for the function f(x)= (x-1)/(x^2+1)? A) 1 B) 0 and 1 C) -1 and 1 D) No values are excluded. Click here to see answer by cartert(27)

 Question 178339: 10u/9t divided by 14u/15tu how do I do this do I use the same fraction rules Click here to see answer by stanbon(57967)

 Question 178374: Solve for u: 5u-w=u+4w what is u? Click here to see answer by nerdybill(7008)

 Question 178434: Given f(x) = -4x+1, find f(a+1) Click here to see answer by jim_thompson5910(28715)

 Question 178488: Solve for y: -10x-4y-10x-y-10=0 what is y? Click here to see answer by Mathtut(3670)

 Question 178541: 9x+13 for x=-3/4 Click here to see answer by Alan3354(31530)

 Question 178540: a^3+2abc-3c^2 for a=5, b=9 and c=-1 Click here to see answer by Mathtut(3670)

 Question 178440: 62) 3/(t-3) = 5/(t+4) ....perform the operation or solve if is an equation (=sign) Thanks!!! Click here to see answer by Fombitz(13828)

 Question 178606: How do i solve 3x-6y=30 and how do i solve y=-6x+34 using the expressions involving variables, substitution? Click here to see answer by stanbon(57967)

 Question 178653: Please give an answer of following to Given f(x)= 3x-2, find f^(-1) (4) thank you. Click here to see answer by Mathtut(3670)

 Question 178730: can you please help me express the simplest radical form of:(((3 square root sign2 + square root sign50))) Click here to see answer by Mathtut(3670)

 Question 178728: can you please help me express the simplest radical form of: (((square root sign m^2/n^3))) Click here to see answer by Mathtut(3670)

 Question 178727: can you please help me express the simplest radical form of: (((3 square root sign8 +2 square root sign16))) Click here to see answer by Mathtut(3670)

 Question 178725: can you please help me express the simplest radical form of: (((6 square root sign7 multiplied by 3 square root sign))) Click here to see answer by Mathtut(3670)

 Question 178729: can you please help me express the simplest radical form of square root sign2+ square root sign2/49))) Click here to see answer by stanbon(57967)

 Question 178726: can you please help me express the simplest radical form of: (((3 square root sign2 + 5 square root sign2))) Click here to see answer by stanbon(57967)

 Question 178736: i NEED HELP I AM GOING TO TAKE MY TEST TODAY AND THERE IS ACTUALLY 10 OF THEM THAT I DO NOT KNOW. THEY ARE ALL ALGEBRA AND SOLVING FOR X IT IS DIFFERENT ONES. (X2+3X)-(X2+2X+3)= THE 2 MEANS TO THE SECOND POWER Click here to see answer by stanbon(57967)

 Question 178814: x-y=4 x-2y=10 Click here to see answer by Mathtut(3670)

 Question 178813: y=x+2 2x+y=8 Click here to see answer by jojo14344(1512)

 Question 178815: 2x+5y=4 x+5y=7 Click here to see answer by jim_thompson5910(28715)
 Question 178815: 2x+5y=4 x+5y=7 Click here to see answer by jojo14344(1512)

 Question 178873: 7c=5d=18 c-5d=-2 Click here to see answer by Alan3354(31530)

 Question 178877: A motorcycle breaks down and the rider has to walk the rest of the way to work. The motorcycle was traveling at 45mi/h, and the rider walks at a speed of 6 mi/h. The distance from home to work is 25 miles, and the total time for the trip was 2 hours. How far did the motorcycle go before it broke down? Click here to see answer by josmiceli(9817)

 Question 178944: can you please help me solve: ((( square root sign x+5 = 8))) Click here to see answer by josmiceli(9817)

 Question 178945: can you please help me write the following in exponential form: (((square root sign x))) Click here to see answer by Alan3354(31530)

 Question 178940: can you please help me express in simplest radical form: (((6 square root sign7 multiplied by 3 square root sign5))) Click here to see answer by josmiceli(9817)
 Question 178940: can you please help me express in simplest radical form: (((6 square root sign7 multiplied by 3 square root sign5))) Click here to see answer by MathLover1(6812)

 Question 178939: can you please help me (((express 0.01 as a fraction. (01 has a line over it) ))) Click here to see answer by Mathtut(3670)

 Question 178949: Simplify by removing grouping symbols and combining like terms. (3x+5)+(2x-9)-(4x+3) Grouping symbols remove: Like terms combined: Click here to see answer by Mathtut(3670)
 Question 178949: Simplify by removing grouping symbols and combining like terms. (3x+5)+(2x-9)-(4x+3) Grouping symbols remove: Like terms combined: Click here to see answer by colliefan(239)

 Question 178951: n-{1-[n-(1-n)-1]} Grouping symbols removed: Like terms combined: Click here to see answer by Mathtut(3670)

 Question 178950: 3j-{2k-[5h-(3j+k)]} Grouping symbols removed: Like terms combined: Click here to see answer by colliefan(239)

 Question 178952: a-{5b-[a-(3b-2c)+c-(a-2b-c)]} Grouping symbols removed: Like terms removed: Click here to see answer by colliefan(239)

 Question 179019: X=14 AND Y=3. 2 TIMES 3 EQUALS 6. Y has to equal 6. 6 + 8 = 14. 7 times 14 equals 98. 98+3=101. Click here to see answer by Crystal1238575(4)

 Question 179020: substitute, x=2y+8 7x+y=101 Click here to see answer by vleith(2825)

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