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

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

Question 381562: Can you help me solve these problems step by step
3^2 X 3^x = 3^8
15^12/5^12 = x^12
5^4 X 6^4 = x^4
Click here to see answer by Fombitz(13828)

Question 381562: Can you help me solve these problems step by step
3^2 X 3^x = 3^8
15^12/5^12 = x^12
5^4 X 6^4 = x^4
Click here to see answer by ewatrrr(10682)

Question 381811: (-2/11+X=6/11)
I'm pretty sure the answer should be 8/11 but don't know how do the work
Click here to see answer by stanbon(57282)

Question 382008: 2x+6y=15
4x+6y=15
solve for x and y
Click here to see answer by Fombitz(13828)

Question 382016: (-4m^3n^3)^3 = -4m^9n^9 is this correct
Click here to see answer by Fombitz(13828)

Question 382001: solve:z=9/13c for c answer:c=13/9c how? Show your work.
Click here to see answer by Fombitz(13828)

Question 382079: what does X-3y=14 X-2=0? plz show work so i may understand.
Click here to see answer by Fombitz(13828)

Question 382092: how to solve -3+x<-x+31
Click here to see answer by jim_thompson5910(28536)

Question 382115: 18)Solve the system of equations by the addition method.
x/4-y/12=-1
x/3+y/9=-2

Click here to see answer by mananth(12270)

Question 382066: -2(K-11)=
Click here to see answer by edjones(7569)

Question 382643: how do you solve a problem like 7 1/4 x = 43 1/3?? Reply ASAP.
Click here to see answer by solver91311(16872)

Question 382643: how do you solve a problem like 7 1/4 x = 43 1/3?? Reply ASAP.
Click here to see answer by Jk22(389)

Question 382643: how do you solve a problem like 7 1/4 x = 43 1/3?? Reply ASAP.
Click here to see answer by rfer(12654)

Question 382944: Multiply. (s+1/3)(s+1/5)
Click here to see answer by stanbon(57282)

Question 383067: Hello Everyone
Please help on the following problem

Use two iterations of the Newton-Raphson method to improve on the solution near x = 2 of the equation
x-1-sinx = 0

Thanks
Click here to see answer by Fombitz(13828)

Question 383212: I am trying to help my son with algebra but I am a bit rusty. He is have a time with symbols of inclusion. here is an example of what I am looking at now: remove the symbols of inclusion and combine similar terms
2a + (b+c) - 4(b-2c) =
Click here to see answer by jim_thompson5910(28536)

Question 383248: zelma is 18 years older than her son. she was 3 times as old as he was one year ago. how old are they now?
Click here to see answer by stanbon(57282)

Question 383466: Can anyone explain how to solve this problem: 24x + 5= 12x + 41. I need to see the work so I can understand the process.
Click here to see answer by mananth(12270)

Question 383470: Find a number which is 130 greater than its opposite.

Click here to see answer by mananth(12270)

Question 383469: Find three consecutive numbers whose sum is 90.
Click here to see answer by rfer(12654)

Question 383469: Find three consecutive numbers whose sum is 90.
Click here to see answer by mananth(12270)

Question 383531: (10^5+5(10))/10^4(20)
Click here to see answer by Fombitz(13828)

Question 383543: 3m=81
Click here to see answer by Fombitz(13828)

Question 383651: -15+2x=45
Click here to see answer by rfer(12654)

Question 383913: 5(6+C)=
N/4=
2X-3=
Click here to see answer by Alan3354(30993)

Question 11577: I need help with this problem, and I also don't really understand multi step equations.
13=5-13+3a

Click here to see answer by jazzypooh37(1)

Question 384055: (x-2)^2-(x-2)(y+1)+(y+1)^2=27
Can you help me find what x and y will equal
Click here to see answer by Fombitz(13828)

Question 384157: 1.) 4b+2(b-4)=8(b+3)
2.) 8r+2=6r+10
3.) 1/5x-1/10x=7/2
4.) 8y-3-9y=5+y-12
Click here to see answer by rfer(12654)

Question 384179: solve the following system of equations.. x + 5y =5 (1),.. x=3-5y (2)
Click here to see answer by texttutoring(324)

Question 384286: Can you help find the slope of 7in risers and 11in tread. Thank you! Shelly
Click here to see answer by stanbon(57282)

Question 384285: Can you help me with finding the slope of a roof that is 8.2ft and 2.6ft. Thank you! shelly
Click here to see answer by stanbon(57282)

Question 384337: 5y+4y=19 y=6x-3 Could somebody solve this and show the steps, using elimination, substitute method.
Click here to see answer by richard1234(5390)

Question 384325: the quotient of one number by another is 14, if the lesser number is represented by m, write an expression for the greater number ( assume m>0 )
Click here to see answer by robertb(4012)

Question 384309: 5y+4y=19
y=6x-3
solve by the substitution method and by showing the steps.
Click here to see answer by mananth(12270)

Question 384580: I have done the following equations and I need to know "For what value is this equation undefined?"
6000/200-2x75%=120 million
6000/200-2x90%=300 million
6000/200-2x99%-3000million
Click here to see answer by stanbon(57282)

Question 384635: how do you solve for x in the following equation: 0.25(4v-8)=0.5(4-2v). I keep getting "0v", which doesn't seem right...
Click here to see answer by stanbon(57282)

Question 384680: I need help, my math skills are nonexistant!
I need to simplify this problem
2 + 4 (3+1) / 8 +1
any help would be greatly appreciated thank you
Blaine
Click here to see answer by edjones(7569)

Question 384684: In the following graph determine the domain and range of the function. The solid dots indicate the end points of the graph. Show your work not just the final answer.

End points (-2,5) and (3,1)
Click here to see answer by richard1234(5390)

Question 385139: I am having trouble figuring out how to do these types of problems, I get to a certain point and then I get completely lost. How would I go about solving this : 5x -7 = 8/7x - 5 +7
Click here to see answer by stanbon(57282)

Question 385089: The area of a yard enclosed by a fence is given by the equation A=-10w^2+120w, where "w" is the width of the yard in meters and "A" is measured in square meters. What is the maximum area?
Click here to see answer by ankor@dixie-net.com(15645)

Question 385423: A scientist wants to research the potential spread of germs by contact. She knows that the number of possible handshakes within a group of "X" people is given by the equation:
N= 1/2(X^2(two meaning squared)-X) or N=1/2(X^2-X) looks better.
N= 1/2 (x squared minus x)
N= 78 (Number of possible handshakes)
I know the answer is 13, but I can't figure out the steps to come to that. I under stand that the X squared is the number of people shaking hands with everyone else minus one person because they don't shake hands with themselves. I also understand that multiplying it times .5 or 1/2 is because they only shake one hand of each person, but other than starting to guess numbers that make X, I can't figure out the steps to get 13.
Thanks!
Janet
Click here to see answer by stanbon(57282)

Question 385654: At the fair, it costs $5.00 to get inside plus $5.00 for every ride you want to go on. Write an expression to represent your costs at the fair.
Click here to see answer by richard1234(5390)

Question 385925: I need step by step help on how to do this problem:
-2w-3z-4+5z
Click here to see answer by Alan3354(30993)

Question 386195: I am having toruble with substitution. I dont understand how to find the solution. A problem I am stuck on is y= 8x-5 y=2x+1
Click here to see answer by scott8148(6628)

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