Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 65584: The combined resistance of two resistors r1 and r2 in a parallel circuit is given by the formula:
Rt = 1
-------
1 1
--- + ---
R1 R2
Thank you for the help
Click here to see answer by Nate(3500)

Question 65573: Solve and check the equation for X
x/6 - x/8 = 1
This equation to me does nto equal 1:
x - x = 0
6 - 8 = -2
The equation should be -2 correct?
Click here to see answer by 303795(602)

Question 65576: Solve the equation for X
2/5 = x-2/20
To get this equation forst I must figure out what x is:
5-2=3
10-2=8
12-2=10
2/5 = x-2/20
2/5 = 10-2/20
Simplest form=
10/5=2
20/5=2
Leaving the eqation with
x=12
Is this right:
Click here to see answer by checkley71(8403)

Question 65575: Solve and check the equation for X
2 = 3 + 9
----- ------- -----------
x+2 x+6 x^2+8x+12
I am confused on this probelm. They added way to many things in there for me to understand. Thank you for the help
Click here to see answer by checkley71(8403)

Question 65574: Solve and check the equation for X
x - x+1 = 8
--- ----- -----
x-2 x x^2-2x
I would first cross out the two x's
Leaving the equation looking like:
0 x+1 = 8
---- - ----- -----
x-2 0 x^2-2x
To go from here I believe I would add x+1= 1x
and subtract x-2 which equals -2x
The equation would look like this:
-2x - 1x = 8
-----
x^2-2x
From here I am lost but I think I became lost a while ago
Click here to see answer by checkley71(8403)

Question 64682: Please help to solve :
-x + 2 / 3 - 2x + 5 / 4 = 5
thank you
Click here to see answer by jayanthihemkos@yahoo.com(87)

Question 65591: Solve
(4x + 5 / 3) + 2 = x/7
Click here to see answer by funmath(2933)

Question 65593: Find x :
ay = b(c/x+e + 3f/h)
Click here to see answer by funmath(2933)

Question 65636: hello, please can you help me solve this. √2x+1=3 I got confused,

Click here to see answer by Earlsdon(6294)

Question 65656: please help me. I am a virtual school student and do not understand how to figure thease out even with the answers.
1)15m+3
------
2
=-6
2)3/2*-15=-12
3)-7x+3=-15/2
4)4x+1/2(12*t2)=3
5)3/2(x+8)=6x

Click here to see answer by funmath(2933)

Question 65703: Solve for X
25x^2 = 13
The X would be a negative number I beleive, is this correct?
Click here to see answer by funmath(2933)

Question 65732: a
Divided by
b + 1 / b + x/c
Click here to see answer by stanbon(75887)

Question 65705: Solve for X
x^2 + 4x + 4 = 7
(factor the left hand side)
4x + 4 = 8x
x^2 + 8x = 7
I have 2 X's and this confuses me since I can not factor them to come up with it to = 7, can someone please explain, thank you
Click here to see answer by checkley71(8403)

Question 65704: Solve for X:
2(x-5)^2=3
I know the first step I believe is to multiply the 2 towards the x and the 5:
2*x = 2x
2*5 = 10
(2x - 10)^2 = 3
The next step is to figure out what X is correct?
2(x) - 10^2 = 3
Gosh I am lost on this step, could someone please give me a hand, thank you
Click here to see answer by checkley71(8403)

Question 64680: Please help solve the equation and give the x-value solution
1/2x+3/5y=3/2
-1/4x-1/8y=1/8
Click here to see answer by chitra(359)

Question 65770: Solve the quadratic equation by completing the square:
2x^2 + 10x + 11 = 0
Can someone please explain to me the idea behind the quadratic equation, thank you
Click here to see answer by Earlsdon(6294)

Question 64595: Solve, using the five-step method.
1. Emma joined a DVD movie club. It cost $10 to join and $17.50 for each DVD ordered, including shipping charges. When her first order arrived, she received a bill for $115. How many DVDs did she order?

2. Laurie�s car gets 20 mi/gal. She plans to drive 440 mi on her vacation. How many gallons of gas will Laurie need for the trip?

Click here to see answer by faceoff57(108)

Question 65817: Solve for X:
x^2+4x+4=7
The answer I recieved was:
X=.645
My teacher has said this is wrong and is not in algebra format. Can someone please help me with the answer and the correct format? Thank you so much for the wonderful help this site brings me and many others.
Click here to see answer by checkley71(8403)

Question 65816: I have turned to you for help in solving this and received an answer, but my teacher has advised me that it is not in correct format. Can anyone please help me make this correct format. Thank you so much:-)
2(x-5)=3
Answer is: X1=3.77 and X2=6.22,
How do I make this look like an algebra equation for an answer?
Click here to see answer by stanbon(75887)

Question 65840: Use the discriminant to determine the kinds of numbers that will satisfy the equation 5x = x^2 - 3. Do not solve
Click here to see answer by 303795(602)

Question 65858: 1/r=1/s+1/t....solve for s
w=a^2/t.....solve for t
thanks
Click here to see answer by funmath(2933)

Question 65899: If a=0.65 and b=1.28 and c= -5/2,evaluate -a(-b)+c.I don't get what to do at all,my answer I get is -5.83 and that's wrong as I was told can you help me? And I have two more problems and that's it.The next one is solve the equation for x, 6x minus 18=4x+8 and I don't know where to begin.And the last one is solve the equation for n,-55 minus 4n=13,there is another problem that I don't know where to begin can you please help me, thank you very much.
Click here to see answer by stanbon(75887)

Question 65914: I have three fraction questions that I need help with because I'm not good with fractions at all the question are,solve the equation for b, 11over12+b=5over6 and I don't know where to start.The next one, solve the equation for f, f-(-7over10)=-4over5.And the last one is, if c=5over6 and d=1 over 4,evaluate 8c over-d and that is the last question thank you for any help I can get.
Click here to see answer by stanbon(75887)

Question 65923: Solve for the indicated variable.
a. 2L+2W=12,for W
b. A=BH+C,for H
Click here to see answer by funmath(2933)

Question 65930: Can you please help me on this question? Mr. Jones has taken a survey of college students and found that 80 out of 81 students studied last weekend. If the college has 7411 students, what is the best estimate of the number of students who studied last weekend?
Click here to see answer by 303795(602)

Question 66031: simplify
7 - 5i
divided by
5 + i
Click here to see answer by josmiceli(19441)

Question 66000:
Click here to see answer by funmath(2933)

Question 66007: This is a problem off of the practice equation problems from this site. I started to work out this problem: 2x^4-54x. I got as far as 2x(x^3-27). I couldn't figure out how they moved from that to the answer of 2x(x-3)(x^2+3x+9)
Can you show the steps on how to get that final answer? I tried to figure it out on my own, but I wasn't even close. Thanks!
Click here to see answer by Cintchr(481)

Question 66057: I tried to start this problem by putting it in standard form but I'm stuck from here
X^2=10x-24
X^2-10x+24=0
a=X, b=-10, c=24
How do I solve for the root
Click here to see answer by algebrapro18(249)

Question 66056: I'm supposed to solve for the roots of each quadratic equation by using the factoring method. This is so confusing to me it's almost painful. I honestly d^2+3x-40=0 on't know where to start.
Xis the problem. If you could get this to make sense to me I would greatly appreciate it.
Karen
Click here to see answer by algebrapro18(249)

Question 66068: Just looking at this problem I am not able to put it in standard form.
P^2+15p+25=6p+5
I'm supposed to be solving for the root of each equation.
It's just not making sense how I should write this.
Thank you
Click here to see answer by algebrapro18(249)

Question 66070: Can you please tell me how to solve this? [100*(x-500)-1350]*14=10,000
Thanks,
Tanya
Click here to see answer by algebrapro18(249)

Question 66070: Can you please tell me how to solve this? [100*(x-500)-1350]*14=10,000
Thanks,
Tanya
Click here to see answer by stanbon(75887)

Question 66073: 5*6x+6*3x=400
Click here to see answer by Nate(3500)

Question 66073: 5*6x+6*3x=400
Click here to see answer by algebrapro18(249)

Question 66002: 9x+2/3x2-2x-8 + 7/3x2+x-4
Thank you
Click here to see answer by Nate(3500)

Question 66083: -4(2x - 3)=-8x + 5
Click here to see answer by funmath(2933)

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39916..39960, 39961..40005, 40006..40050, 40051..40095, 40096..40140, 40141..40185, 40186..40230, 40231..40275, 40276..40320, 40321..40365, 40366..40410, 40411..40455, 40456..40500, 40501..40545, 40546..40590, 40591..40635, 40636..40680, 40681..40725, 40726..40770, 40771..40815, 40816..40860, 40861..40905, 40906..40950, 40951..40995, 40996..41040, 41041..41085, 41086..41130, 41131..41175, 41176..41220, 41221..41265, 41266..41310, 41311..41355, 41356..41400, 41401..41445, 41446..41490, 41491..41535, 41536..41580