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

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

Question 80122: How many terms are in the following expressions?
1. x + 2y
2. x2y
3. 3x3y2z
4. 3x3y2 + z
5. x2 - 2y + 3
Click here to see answer by stanbon(57337)

Question 80128: Add. Express your result in simplest form.
4/xy + 6/xy
My answer is: 10/ x^2 y^2 am I right?

Click here to see answer by stanbon(57337)

Question 80270: What is L=1/4r For r ?
Click here to see answer by stanbon(57337)

Question 80276: Could I please get some help with this?
1/2(2x+2a)=1/3(21+3b) For x
Click here to see answer by stanbon(57337)

Question 80275: Hello Could you please help me with this?
M= 2x+y+2z/6 For x
Click here to see answer by stanbon(57337)

Question 80277: Please help I have been trying to figure this problem out but am unable to even get started
-9x+2y=2
+6x+8y=-6
Click here to see answer by stanbon(57337)

Question 80277: Please help I have been trying to figure this problem out but am unable to even get started
-9x+2y=2
+6x+8y=-6
Click here to see answer by checkley75(3666)

Question 80233: When John F. Kennedy was Sworn in as President, he was 1 year older than Teddy Roosevelt was when Roosevelt took the office. If the sum of their when each became President was 85, how wold was Kennedy when he was sworn in?
Click here to see answer by checkley75(3666)

Question 80273: What is 6(q/m)/(m/2t)=1 For q?
Click here to see answer by sofiyacherni(99)

Question 75212: It says to Factor completely:
x^3-5x^2+7x-35

Click here to see answer by sofiyacherni(99)

Question 80544: Solve the equation.
a^2-a-2=0
Click here to see answer by tutorcecilia(2152)

Question 80550: Solve for r.
V=4/3 3.14(pie)r^2h.
Click here to see answer by tutorcecilia(2152)

Question 80549: Solve the equation.
6/x-3 = 9/x+3
Click here to see answer by tutorcecilia(2152)

Question 80578: Hi, My question is from Chapter 10 Review Exercises 678
#94 Find all real or imaginary solutions to each equation.
49x^2 + 9=42x
Click here to see answer by tutor_paul(490)

Question 80572: Find the distance between the given pair of points (round your answer to the first decimal point if necessary).
(-7,-3), (8,6).
Click here to see answer by jim_thompson5910(28595)

Question 80657: Solve the system by substitution.
3x - y = -7
x + y = -9
Click here to see answer by praseenakos@yahoo.com(507)

Question 80738: PLEASE I NEED HELP WITH THIS EQUATION X=2Y-1
Y-X=-5
AND I HAVEN'T GOT VERY FAR.
Click here to see answer by stanbon(57337)

Question 80763: what is 4(2m-3)-(3m-5) ?
Click here to see answer by vertciel(183)

Question 80762: what is -8x+5-2x-15+12 ?
Click here to see answer by vertciel(183)

Question 80813: (2,5); x+5y=7
(5,8); 3x+y=8
I'm trying to get the above in y=mx+b form.

Click here to see answer by stanbon(57337)

Question 80810: May you please help me solve this equation

1/2+(2x-1/2)+3/4(x+5)=7/8
Click here to see answer by stanbon(57337)

Question 80575: Solve the equation by using the quadratic formula.
2a^2-3a-2=0
Click here to see answer by sofiyacherni(99)

Question 80964: Please explain how to solve this when the questions have parenthesis. Thank you
6n=5(n-7)
Click here to see answer by checkley75(3666)

Question 81131: algebra is gay please help
please help us SIMPLIFY this expression
4n+28
---------
n2-6n-7
Click here to see answer by josmiceli(9674)

Question 81181: Simplify
I really dont know what to try due to different terms and parenthesis.
Click here to see answer by stanbon(57337)

Question 81187:
I tried common denominators to get:
12x/20x + 8x/20x = 20x
20x/20x=20x ?
Click here to see answer by tutor_paul(490)

Question 81187:
I tried common denominators to get:
12x/20x + 8x/20x = 20x
20x/20x=20x ?
Click here to see answer by Edwin McCravy(8908)

Question 81206: Simplify
Using LCD I ended up with (5x^2 +4) / 4x where do I go from here?
Click here to see answer by ankor@dixie-net.com(15650)

Question 81230: Could you please help me out with this problem. Math is so hard and confusing to me.
4x-12y=5
-x+3y=-1
Click here to see answer by stanbon(57337)

Question 81307: Simplify by removing factors of 1. (5w-20)/5w
Click here to see answer by praseenakos@yahoo.com(507)

Question 81345:
I thought LCD and got but don't know where to go from here
Click here to see answer by Edwin McCravy(8908)

Question 81347: Solve
I used LCD and got (1x/(x^2 +2x))- (2x +4)/(x^2 + 2x) =3
Then multiplied bith sides by x^2 -2x
3x^2 - 5x -4
Click here to see answer by bucky(2189)

Question 81347: Solve
I used LCD and got (1x/(x^2 +2x))- (2x +4)/(x^2 + 2x) =3
Then multiplied bith sides by x^2 -2x
3x^2 - 5x -4
Click here to see answer by Edwin McCravy(8908)

Question 81346: A biologist catches and marks 20 perch from a lake. A week later she catches 50 fish, of which 12 are marked. Write the equation he can use to get a good estimate of the perch.

Click here to see answer by stanbon(57337)

Question 81415: Can you help me solve please?
x/x-3+2=3/x-3 I don't see a solution but i am not sure
Click here to see answer by stanbon(57337)

Question 81417: can someone please please help me simplify?
1+3/7
over
3-1/3
Click here to see answer by stanbon(57337)

Question 81416: can you help me factor completely?
5x^2-2xy+5x-2y
Click here to see answer by stanbon(57337)

Question 81413: please help these are due today.
solve by substitution.
5x-2y=-5
y-5x=3

4x-12y=5
-x+3y=-1
Click here to see answer by stanbon(57337)

Question 81606: can someone please check this for me?
10/y-8 - 1/x+1
10/y-8-(1/y+1)
10/y-8-1/y-1
10/y+-9-1/y
10/y-1/y+-9
10/y-1/y-9
10-1/y-9
9/y-9
Click here to see answer by stanbon(57337)

Question 80571: Solve the equation and check for extraneous solutions.
square root 9a^2 +a-7 = 3a
Click here to see answer by mathdoc314(58)

Question 81758: the ratio of fairies to elves is 7/2 - the total of fairies is 11 more than 3 times the amount of elves - f=11+3y i can not get the starting point for answer which is 77 fairies and 22 elves 22x3=66 66+11=77
can you help with this
thanks
j.a.mixson
Click here to see answer by rapaljer(4667)

Question 81766: How do I multiply and solve 3xy2(5xy – 4x + 6y)?
Click here to see answer by rapaljer(4667)

Question 81761: please help.
Solve the system by addition.
2x-9y=-4
x-4y=-1
Click here to see answer by jim_thompson5910(28595)

Question 81887: Can you help me solve the following for x :
x/(x+3) = 5/(x+7)
Thanks!
Click here to see answer by sofiyacherni(99)

Question 81902: I'm really having trouble with these few problems here and I can't call anyone from my Algebra class that I know because they're all busy, so I was hoping that someone could help me? If you can you would forever have my gratitude!!
10. x/x^2-3=5/x+4 I know there is two answers to this problem
14. 4w/3w-2+2w/3w+2=2 I know the answer is w=4.
16. 12/x^2-16-3=24/x-4 The answers are -6 and -2.
Please, please tell me how to do these problems!!
Click here to see answer by Earlsdon(6287)

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