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

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

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 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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