Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 211018: 3(-7x+9)=3(-7x)+3(9)= 21x+27
Click here to see answer by bobbi1224(1)

Question 211032: This is the problem I need to solve for X
5-(8+3x)=2x+3
The answer is X= -6/5 (I am unable to figure out the answer on my own)
This is what I come up with.
5-(8+3x)=2x+3
-40-15X=2X+3
-40-2X-15X=2X-2X+3
-42X-15X=3
-57X=3
(1/57*57/1)X=1/57*3/1
X=-19
Please can someone let me know where I have gone wrong. I have tried several different ways to try and find the answer and I keep getting it wrong.
Click here to see answer by stanbon(75887)

Question 211077: Solve. Where appropriate, include approximations to the nearest thousandth. If no solution exists, state this.
log x = 2.5
I came up with the answer below. Is this correct?
logx=2.5
10^(logx)=10^(2.5)
x=10^(2.5)
x=316.23
Click here to see answer by nerdybill(7384)

Question 211139: Solve the equation or formula for the specified variable.
a=3b-c solve for b

I don't understand how to do it
Click here to see answer by Alan3354(69443)

Question 211157: find the midpoint of the line segment having the given endpoints 8, -4 and -7 ,8
Click here to see answer by rfer(16322)

Question 211075: Solve. Where appropriate, include approximations to the nearest thousandth. If no solution exists, state this.
ln x = 7
Click here to see answer by edjones(8007)

Question 211233: Professor williamson counts his midterm as 2/3 of the grade and his final as 1/3 of the grade. Wendy scored only 48 on the midterm what range of scores on the final exam would put wendy's average between 70-90 inclusive?
I tried this 48 + x = 79
x = 79-48
x = 28
Click here to see answer by Theo(13342)

Question 211252: 1.x+a/b + b=A
2.bx+a=dx+c
3.cx-b=ax+d
Click here to see answer by stanbon(75887)

Question 211346: 2/3+3y=5y-2/15
Click here to see answer by checkley77(12844)

Question 211371: what is 208.637 correct to 2 significant figures?

Click here to see answer by RAY100(1637)

Question 211371: what is 208.637 correct to 2 significant figures?

Click here to see answer by checkley77(12844)

Question 211391: -5x + 44 = 4 (x-7)
Need to solve for X
Click here to see answer by jim_thompson5910(35256)

Question 208360: it's called solving multi-step equations
#14 is 15=-3(2q-1) and #22 is x-5/8=7/8
i really need help with it
Click here to see answer by Earlsdon(6294)

Question 211482: y+20=4y-10
How do I find the value of y?
Click here to see answer by jim_thompson5910(35256)

Question 211493: x-{3x-[2x-(8-x)+2]+3}-6=0
Click here to see answer by jim_thompson5910(35256)

Question 211504: 1/2(z-3)=-4/5(z-1/6)
Click here to see answer by jim_thompson5910(35256)

Question 211520: 0.7(3x+6)=1.1-(x+2)
Click here to see answer by jim_thompson5910(35256)

Question 211535: When solving a rational equation, why is it important to to check your final answer(s)?
Click here to see answer by rfer(16322)

Question 211580: 2/5x+1=1/3+x
Click here to see answer by jim_thompson5910(35256)

Question 211593: 8+4m=9m-7

Click here to see answer by rfer(16322)

Question 211632: what is the scientific notation for 8910?
Click here to see answer by gypsy1274(9)

Question 211647: I need a equation that uses the numbers 1,2,3,and 4 and the total equals 48 and your not allowed to divide.
Click here to see answer by checkley77(12844)

Question 211666: Can you please help me with this problem?
2/3(15-6a)=5/6(12a+8)
Use the distributive property
thank you!
Click here to see answer by jim_thompson5910(35256)

Question 211704: Suppose M is between L and N. Use the segment addition postulate to solve for the variable. Then find the indicated lengths.

LM= 5x+9, MN= 2x-6, LN = 59

find x, LM, and MN please. Please show work. this is to study for a big test tomorrow.
Click here to see answer by stanbon(75887)

Question 211719: How many square yards of carpet are needed to carpet a room that is 15 ft by 25 ft?
Click here to see answer by nerdybill(7384)

Question 211739: how to solve the equation:
0.42-0.03y=3.33-y

Click here to see answer by rfer(16322)

Question 211748: 4x+9y=30;x=3
4(3)+9y=30
12+9y=30
9y=18
y=2
Click here to see answer by alcole(1)

Question 211721: 7a-b=14;solve for b
Click here to see answer by math problem solving(30)

Question 211741: Hi all, I was hoping to get some help with the following 2 intergrals.
I have to evaluate each one using the given substitution in each.
a) ∫( (x^2x) / ((3 + x^3)^2) ) Substitution, u = x^3
b) ∫ \( x^7 cos x^8dx) Substitution u = x^8
Help with steps and notes on how to solve would be gret.
Thanks, -Nick.
Click here to see answer by jsmallt9(3758)

Question 211789: 15= 45/x <--------- Fraction.
Click here to see answer by checkley77(12844)

Question 211789: 15= 45/x <--------- Fraction.
Click here to see answer by rfer(16322)

Question 211720: -8-(x-7)+2x=4
Click here to see answer by checkley77(12844)

Question 211801: How do I write a algebric expression for
seven times the sum of a number and six
Click here to see answer by Theo(13342)

Question 211998: Tony has twice as much money as Alicia. She has $16 less than Ralph. Together they have $200. How much money does each have?
Click here to see answer by drj(1380)

Question 212016: betty is thinking of two consecutive integers whose sum is 41. Let x represent the smaller unknown integer.
a. How could you represent the larger unknown integer in terms of x?
b. Write an equation showing that the sum of the two unknown integers is 41.
c. Solve your equation. What integers is Betty thinking of?
Click here to see answer by rfer(16322)

Question 212027: how can 9,8,19,7, and 8 equal 2
Click here to see answer by Alan3354(69443)

Question 212059: I was givien the following problem:
Write the equation 2x+3y=9 in function form and find f(-1) and f(6)

Click here to see answer by drj(1380)

Question 212072: The problem is the following:
One number is four less than three times another. If their sum is increased by five, the result is twenty-five. Find the numbers.
I thought that maybe the equation would be x=3x-4 but it just doesn't work, then another way I thought would work would be x-4<3x but I don't know where to go from thier. I've been on this problem for an hour looking online for some help. I even went through a 40 minute free lesson online. It was too simple too help me though. Hopefully you can help me!
Click here to see answer by rfer(16322)

Question 212101: Dear Tutor,

I would like to know how can I arrive/make:
y*z*(z-y)+x*y*(y-x)+x*z*(x-z)

into

(x-y)*(y-z)*(z-x)

I have tried multiplying all factors also tried to divide by factor:y and than factor:z but that's where I got stuck so I'm not sure if I'm even close to the right method.

Thank you for your time and effort,

Gabi
Click here to see answer by jsmallt9(3758)

Question 212136: i need a solution to the ordinary differential equation
x"+2x'+2x=0
Click here to see answer by Fombitz(32388)

Question 212136: i need a solution to the ordinary differential equation
x"+2x'+2x=0
Click here to see answer by drj(1380)

Question 212177: Help me please!!!
A new machine can make 10,000 aluminum cans three times faster than an older machine. With both machines working, 10,000 cans can be made in 9 hours. How long would it take the new machine, working alone, to make the 10,000 cans?
I don't know how to show my work on this! :(
Click here to see answer by stanbon(75887)

Question 212206: Solve:
3w-2x+4y-z=-2
5w+3x-2y+7z=-36
2w-5x+6y-2z=2
-4w+6x-8y+9z=-26
Click here to see answer by Alan3354(69443)

Question 212234: n+100=1,000,000

Click here to see answer by rfer(16322)

Question 212231: What is the mass, volume, and density for a textbook that is 3.4 pounds?

please show work
Click here to see answer by ichudov(507)

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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