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

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Algebra: Expressions involving variables, substitution

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Question 12244: I am a parent helping with homework. I am stumped on this one:
Solve for r: S=(rL-a)/(r-1)
Click here to see answer by AdolphousC(70)

Question 12754: solve 1m+2/5=1/2

Click here to see answer by blue16_1989(2)

Question 12915: how would you solve a problem such as -7a=-12a-65? i dont understand this

josh
Click here to see answer by kusha(21)

Question 12902: I can't seem to figure this question out....thankful for any help
9x^4=25x^2-16
Click here to see answer by kusha(21)

Question 12987: i really need ur help solving this equation: 21x+3=121
Click here to see answer by pwac(251)

Question 12987: i really need ur help solving this equation: 21x+3=121
Click here to see answer by rapaljer(3612)

Question 12987: i really need ur help solving this equation: 21x+3=121
Click here to see answer by askmemath(368)

Question 13046: 8(3w+2x)-9w+4x
Click here to see answer by pwac(251)

Question 13035: i need help with prime factorization. i have no idea what it is and i have a homework assignment on it. one of the examples is:
60
Click here to see answer by elima(1433)

Question 13063: -5+(3*1)=-3
Click here to see answer by Ponder(3)

Question 13120: 7(3x+4)=8(2x+5)+13 how do I solve this problem? I have a teacher who doesn't want to help very much.
Click here to see answer by akmb1215(68)

Question 13118: 2x + 3y = 31
y = x + 7

Click here to see answer by akmb1215(68)

Question 13092: 16(x+3)=-4(-3-4x)
I need to know the anwser.
Click here to see answer by rahman(247)

Question 13137: If 3(4x+5(3.14))=P, then 6(8x+10(3.14))=
Please help solve this problem
Click here to see answer by uksraj(9)

Question 13221: A STUDENT WAS REASERCHING ALASKAN GLACIERS. HE USED DIFFERENT SOURCES TO FIND THE SPEED AT WHICH 3 GLACIERS ARE MOVING
Glacier Speed
Sliding 4per day
Hanging 3 inches per hour
Drifting 6*10 negative 5 miles per hour
and i have to convert them to all the same
to see which uis moving at the greatest speed? Please help im really stuck on how to do the equation parts to convert them all to the same #'s like feet per day i thought it would be best if gone into 4 fette per day but i got the wrong answer
Please Help Thanks

Click here to see answer by rapaljer(3612)

Question 13229: 3/8-1/4t=1/2t-3/4
Click here to see answer by rahman(247)

Question 13225: -2g+4(4+g)=2g-4(6-3g
Click here to see answer by rahman(247)

Question 11908: Simplify: a^2bc^3a^5b^2ca
Click here to see answer by rahman(247)

Question 13323: D=rt for r
Click here to see answer by longjonsilver(2297)

Question 13194: 20=1/10r ( find value of r)
Click here to see answer by smik(40)

Question 13182: If 3(4x+5(3.14))=P, then 6(8x+10(3.14))=
Please help me solve this problem. If you can, please show the work.
Thank You
Click here to see answer by smik(40)

Question 13004: solve
3a-8=(a/2)+2
a/2 is a fraction, but I didn't know how to write it on here
thanks
Click here to see answer by smik(40)

Question 13413: If I need to find the opposite of the expression 7x + 3x.
Click here to see answer by lainey(7)

Question 13441: what is the answer to this problem 9x=44-2x
Click here to see answer by Earlsdon(4898)

Question 13449: Please Help Me solve this Equation, 6s-11=-2s+5
Click here to see answer by askmemath(368)

Question 13559: I have three problems that do not have instructions as to what to do. I see the equal sign and assume I am to solve the equation. The problem is stated
5(t+3)+9 = 3(t-2)+6 Only because when I put in the answer that seems obvious it is usually wrong, I thought an answer to whether this is true or not will help me to know if I'm on the right track before going on. I have
5t+15+9 = 3t-6+6 on first line
5t + 24 = 3t on second line
-5t -5t
24 = -2t
(/)-2 + (/) -2
-12 = T ( T = -12 )
Click here to see answer by ntnk(49)

Question 13545: How do you find what F is in an equation like P=F/A
Click here to see answer by LilSkittleMd(119)

Question 13562: What is the answer to th following question: Solution A is 30% acid and solution B is 70% acid. How much of each should be used to make 100 mL of a solution that is 58% acid?
Click here to see answer by longjonsilver(2297)

Question 13615: 7y+8y
Click here to see answer by longjonsilver(2297)

Question 13764: -2x-5=x+4
Click here to see answer by tjnw79(57)

Question 13763: 2u+18=
have to solve by factoring, and i don't know how because there is no answer...
Click here to see answer by rahman(247)

Question 13801: IS THERE A SIMPLE METHOD OF FINDING THE EXPONENTS VALUE? I'VE BEEN OUT OF SCHOOL SO LONG THAT ITS HARD TO HELP MY SON WITH HIS HOMEWORK.
AN EXAMPLE OF HIS WORK IS: 21/2x-5=17 or -2x-5-x-8-5x-3=0

Click here to see answer by longjonsilver(2297)

Question 13701: hi, my name is nikki, and i am having a problem understanding how in solving an equation with grouping symbols. i am VERY bad at math and i really need it step by step. if you can help me i'd really appreciate it alot

thank-you,
nikki
Click here to see answer by longjonsilver(2297)

Question 13027: i really really need help on solving 15= -3 (x-1) +9 thanks alot!
Click here to see answer by LilSkittleMd(119)

Question 13002: How do I find: 5-x-x= -1
I have tried to cancel out the 5 and then use like variables and do it the other way aroud and I still can't figure it out! Thanks for your help.
Click here to see answer by LilSkittleMd(119)

Question 13677: 3(r+1)-[2(3-2r)-3(3-r)]=2(r+5)-4
Click here to see answer by LilSkittleMd(119)

Question 13810: -2=7(q+2)=3(2q-1)
Click here to see answer by culleys(1)

Question 13668: 7-4c=10c
Click here to see answer by LilSkittleMd(119)

Question 13908: 7b+5-9b+c=
x+2(x-y)=
-5u+6+u+4u=
(5x+y)-(4x-9)=
Click here to see answer by rahman(247)

Question 13866: What is a like term and an example
Click here to see answer by elima(1433)

Question 13924: can you show me how to work problem 8b-4=5b+8
Click here to see answer by tjnw79(57)

Question 13954: I could not figure this question out....3y2-2brackety-(3-2y)bracket=3(y-2)to the 2nd power -12? The choices are a)0 and -1 B)0 and -2 C)0 D)-1 E)-2 Thank you for your time.
Click here to see answer by rapaljer(3612)

Question 13943: can you show me how to work the following problem:
3/2y - y = 4 + 1/2y
Click here to see answer by rahman(247)

Question 13968: Could you help with this one I'm stuck on it.

Thank you for all your help you realy save me!!!!

Click here to see answer by elima(1433)

Question 13966: Please Help I hope im doing this right but wont to make sure could you help please?
Thank you so much
Click here to see answer by elima(1433)

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