Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 54622: 3/4 k+1= 3/8 - 2k
Click here to see answer by terbear1963(43)

Question 54670: 8y-(8+6y)=20
Click here to see answer by checkley71(8403)

Question 54697: The diameter of Earth is about twice that of Mars. The diameter of Mars is about three times that of Pluto. Together, the sum of the diameters of Earth, Mars, and Pluto is about 30,000 kilometers less than the diameter of Uranus. If the diameter of Uranus is about 52,000 kilometers, what equation would be used to find the approximate diameter of Pluto? Let d = diameter of Pluto.
Click here to see answer by ankor@dixie-net.com(22740)

Question 54728: Can someone help me on this problem?
I need to solve this equation for x, and then check results:
6(6-x) = 3x
Thanks,
Sher
Click here to see answer by rchill(405)

Question 54763: A=PI*r2 if A=113.04sq ft and PI*=3.14 what is r
Click here to see answer by psbhowmick(878)

Question 54763: A=PI*r2 if A=113.04sq ft and PI*=3.14 what is r
Click here to see answer by tutorcecilia(2152)

Question 54763: A=PI*r2 if A=113.04sq ft and PI*=3.14 what is r
Click here to see answer by funmath(2933)

Question 54797: Can someone help me solve this problem?
8x -11 = 2x + 1
Thanks, Lisa
Click here to see answer by hulamc723(15)

Question 54849: m-m2=0

Click here to see answer by tutorcecilia(2152)

Question 54795: I need some help in solving this problem:

2x + 4 = -8
Thanks, Lisa
Click here to see answer by funmath(2933)

Question 54796: Can someone help me on this problem?
I need to solve: -6(x + 3) -10 = 3(-2x -5) -13
Thanks, Lisa
Click here to see answer by funmath(2933)

Question 54839: Can someone help me on this?
I need to translate the following statement into an algebraic equation. Let x represent the number:
7 more than a number is 19
Thanks, Lyn
Click here to see answer by checkley71(8403)

Question 54901: I need help on the following problem:
The difference when 7 less than a number is subtracted from twice the number is 12. What is the number?
I have no clue as to how to set up this equation. Please help!
thanks!
Click here to see answer by checkley71(8403)

Question 54801: Can someone help me on this?
Is -4 a solution to the equation: 7x -5 + 3x = 6 + x - 10
Thanks,
Asley
Click here to see answer by stanbon(75887)

Question 54914: Can someone help me on this?
Is 4 a solution to the equation x + 7 = 11 ?
Thanks,
Adriana
Click here to see answer by stanbon(75887)

Question 54835: Can someone help me on this?
I need to solve: 7x - 5 = 6x
Thanks,
Lyn
Click here to see answer by wgomero(28)

Question 54913: Can someone help me on this?
I need to solve: 3x/7 - 5x/3 = 2/21
Thanks,
Adriana
Click here to see answer by rapaljer(4671)

Question 54925: P and Q are whole numbers such that 0 I have absolutely no idea. I don't really understand the way the problem was worded. It would be great if I had some help!
Click here to see answer by rapaljer(4671)

Question 54959: Can someone help me solve this problem?
I need to find two solutions for the following equation:
When x number of units are sold, the price of each unit (in dollars) is given by p = -x/2 + 75. I need to find the unit price when the following quantities are sold: 9 and 11.
Thanks,
Sher
Click here to see answer by stanbon(75887)

Question 54956: Can someone help me on this equation?
I need to complete the order pair so that each is a solution for the given equation:
3x + 4y = 12
pair 1 is (8/3,)
pair 2 is (0,)
Thanks,
Sher
Click here to see answer by rapaljer(4671)

Question 55003: how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution. Can you please show the formula for mixture problems. thank you.
Click here to see answer by stanbon(75887)

Question 54787: Can someone help me on this problem?
Is 4 a solution to the equation x + 7 = 11?
Thanks,
Sher
Click here to see answer by rchill(405)

Question 54245: x-15=-3 (I have to find out what the x is)
Click here to see answer by rchill(405)

Question 55038: Two records and three tapes cost $31. Three records and two tapes cost $29. Find the cost of each record and each tape
Let's call x the cost of records and y the cost of tapes. As a side note, who really cares? Don't we all buy CDs if not MP3s now?
Anyway, the first sentance in math-speak says:
2x + 3y = 31
And the second says
3x + 2y = 29
There are a few basic ways to tackle this problem:
a) Addition method
b) Substitution method
c) Matrix method.
d) Graph method
I think I'm a fan of the substitution.
we'll take the first equation and solve for x
2x + 3y = 31
Subtracting 3y from both sides gives
2x = -3y + 31
And divide by two.
x = -3/2y + 31/2
Ok...now we take the second equation
3x + 2y = 29
and substitute x = -3/2y +31/2 in for x
3(-3/2y +31/2) +2y = 29
Now, we'll simplify the whole mess.
-9/2y + 93/2 + 2y = 29
Combine like terms
-5/2y + 93/2 = 29
Moving the 93/2 to the right side yields
-5/2y = 58/2 - 93/2
-5/2y = -35/2
dividing by -5/2 gives
y = -35/2(-2/5)
y = 7
Ok...y = 7! Let's sub that into one of our original equations and solve for x.
2x + 3(7)=31
2x + 21 = 31
2x = 10
x=5
We've got x=5 and y = 7. Lets check our answers with the second equation just to make sure we've got it.
3(5) + 2(7) = 29
15+14=29
29=29
Yep..we did it right!
Records are $5 and Tapes are $7
Click here to see answer by Hook(36)

Question 54802: Can someone help me on this problem?
The length of a rectangle is 2 cm more than twice its width. If the perimeter of the rectangle is 52 cm, find the dimensions of the rectangle.
Thanks, Ashley
Click here to see answer by Cintchr(481)

Question 54786: Can someone help me on this problem?

I need to solve:
3x/7 - 5x/3 = 2/21
Thanks,
Sher
Click here to see answer by Cintchr(481)

Question 54815: HELP!!!!!!!!!!!!!!!!!!!! My boyfriend says that if I solve for P that I will know in the number of weeks when he will propose!
p2 + 3P + 2 = 3/2 + 3p -3
___________
p + 1
ALso, he said the answer is not 1 or 1.75 or 7/4???
Click here to see answer by Hook(36)

Question 55077: What is the process to solve x - 2x = 15 ? Do I have to factor something?
thanks!
Click here to see answer by anjulasahay(30)

Question 55077: What is the process to solve x - 2x = 15 ? Do I have to factor something?
thanks!
Click here to see answer by funmath(2933)

Question 55079: Factor completely. x^2 – 3x – 18 I got (x – 3)(x + 6) is that correct
Click here to see answer by rchill(405)

Question 55134: I am stuck on correct answer for:
one of the solutions of the equation x^2 - x = 12 is:

I believe answer is "-4" but I need to verify my work. Can you show me the breakdown to get correct resolve?
Click here to see answer by psbhowmick(878)

Question 55133: I am stuck on correct answer for:
7x + 4 is less than or equal to 5x - 2 is equivalent to:

I believe answer is "x is less than or equal to 3" but I need to verify my work. Can you show me the breakdown to get correct resolve?
Click here to see answer by Hook(36)

Question 55149: This problem was on hand out. I think I solved it correctly, but am not sure.
My answer is 360mn.
thanks for your help.
-60m (-2) (-3n)
Click here to see answer by tutorcecilia(2152)

Question 55135: I am stuck on correct answer for:
if x - 2/7 x = 5, then x =
I believe answer is "7" but I need to verify my work. Can you show me the breakdown to get correct resolve?
Click here to see answer by checkley71(8403)

Question 55195: Solve the equation abx=cy for each of the following
the variable x

the variable a

the variable c PLEASE HELP ME I AM JUST CONFUSED?!?!?!?!
Click here to see answer by stanbon(75887)

Question 55201: what is this problem and put it in standard form:-5y=-3/4-4
Click here to see answer by checkley71(8403)

Question 55168: Express 2x^2+2y^2-12x+16y=-32 in standard form for a circle. Identify the radius and center of the circle.
Click here to see answer by venugopalramana(3286)

Question 55254: Can someone help me on this problem?
I need to find 2 solutions for the following equation:
When x number of units are sold, the price of each unit (in dollars) is given by p = -x/2 + 75. I need to find the unit price when the following quantities are sold: 2, 7
Thanks,
Sher
Click here to see answer by funmath(2933)

Question 55169: Graph the equation of the line -3x+4y=9
Click here to see answer by tutorcecilia(2152)

Question 55211: 1.29=a/3.5(1-a)
a=0.82
How do I solve for a? What does the equation look like? I can't figure out how to get a by itself. Thanks!
Click here to see answer by funmath(2933)

Question 55354: I can not get this question on my homework, I can, but I can not get it in steps! Question:
2(x+4)=16
39).The number of time a cricket chirps in a minute is a function of the temperature in the formula: n=4t-160, where n=number of times a cricket chirps a minute and t=temperature in farenheit.
You can use the temperature t=(1/4)n+40 to estimate the temperature based on the number of chirps per minute.
a) At 60 degrees, how many times does a cricket chirp a minute.
b) What is the temperature when the number of times a cricket chirps per minute is 150.
c) At what temperature does a cricket stop chirping?
d) Graph the equation of the line with the number of chirps as the x-axis, what does the y-intercept represent?
Thank you for your help!
Alex
Click here to see answer by funmath(2933)

Question 55399: solve each equation. check your solution
8+3k=5
Click here to see answer by funmath(2933)

Question 55398: Solve each equasion. Check your solution.
8+3k=5
Click here to see answer by Cintchr(481)

Question 55441: To whom may it concern,
I have this tricky question to solve.
If x + 2y = -2 and x � 2y = 18, find the value of x^2 + 4y^2.
According to my teacher, the answer is 164 but how ?

Please help. Thanks.
CH Lam
Click here to see answer by tutorcecilia(2152)

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33526..33570, 33571..33615, 33616..33660, 33661..33705, 33706..33750, 33751..33795, 33796..33840, 33841..33885, 33886..33930, 33931..33975, 33976..34020, 34021..34065, 34066..34110, 34111..34155, 34156..34200, 34201..34245, 34246..34290, 34291..34335, 34336..34380, 34381..34425, 34426..34470, 34471..34515, 34516..34560, 34561..34605, 34606..34650, 34651..34695, 34696..34740, 34741..34785, 34786..34830, 34831..34875, 34876..34920, 34921..34965, 34966..35010, 35011..35055, 35056..35100, 35101..35145, 35146..35190, 35191..35235, 35236..35280, 35281..35325, 35326..35370, 35371..35415, 35416..35460, 35461..35505, 35506..35550, 35551..35595, 35596..35640, 35641..35685, 35686..35730, 35731..35775, 35776..35820, 35821..35865, 35866..35910, 35911..35955, 35956..36000, 36001..36045, 36046..36090, 36091..36135, 36136..36180, 36181..36225, 36226..36270, 36271..36315, 36316..36360, 36361..36405, 36406..36450, 36451..36495, 36496..36540, 36541..36585, 36586..36630, 36631..36675, 36676..36720, 36721..36765, 36766..36810, 36811..36855, 36856..36900, 36901..36945, 36946..36990, 36991..37035, 37036..37080, 37081..37125, 37126..37170, 37171..37215, 37216..37260, 37261..37305, 37306..37350, 37351..37395, 37396..37440, 37441..37485, 37486..37530, 37531..37575, 37576..37620, 37621..37665, 37666..37710, 37711..37755, 37756..37800, 37801..37845, 37846..37890, 37891..37935, 37936..37980, 37981..38025, 38026..38070, 38071..38115, 38116..38160, 38161..38205, 38206..38250, 38251..38295, 38296..38340, 38341..38385, 38386..38430, 38431..38475, 38476..38520, 38521..38565, 38566..38610, 38611..38655, 38656..38700, 38701..38745, 38746..38790, 38791..38835, 38836..38880, 38881..38925, 38926..38970, 38971..39015, 39016..39060, 39061..39105, 39106..39150, 39151..39195, 39196..39240, 39241..39285, 39286..39330, 39331..39375, 39376..39420, 39421..39465, 39466..39510, 39511..39555, 39556..39600, 39601..39645, 39646..39690, 39691..39735, 39736..39780, 39781..39825, 39826..39870, 39871..39915, 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