Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 729651: can anybody help me to solve this equation for b?
c(a^2-b^2)/(a^2+b^2)^2=0
I know the results already! I just want to understand how to get them.

Click here to see answer by MathLover1(20849)

Question 729278: Please help me solve this. Evaluate the functions when x=2, x=0
h(x)=8x+7
g(x)=5x-6
Click here to see answer by math-vortex(648)

Question 729412: 4x+4y=5 (2x+8y=-5)
Click here to see answer by checkley79(3341)

Question 729717: 3/4a + 1=2/3a - 1/4a
Click here to see answer by checkley79(3341)

Question 729693: Which of the expressions are perfect cubes? (Select all that apply.)?
9_NO_
m^6n^9_YES_ [m^2n^3]
64mn^12_NO_
y^15 _YES_ [y^5]
8_YES_ [2]
Click here to see answer by checkley79(3341)

Question 729754: A two digit number and the resulting number when the digits are reversed are in the ratio 2:9.If the sum of the digits is 9,Find the original number.
Click here to see answer by ankor@dixie-net.com(22740)

Question 729830: a rectangle has a perimeter of 36cm. the square of the length of its diagonal is 164 square metres. find the dimensions of the rectangle.
Click here to see answer by mananth(16946)

Question 729844: a table for y=x^2-49 is given. Need to solve each equation for inequality.
a) x^2-49=0 b)x^2-49<0 c)x^2-49>0
table
x -8 -7 -5 0 5 7 8
y 15 0 -24 -49 -24 0 15
I thank you so much in advance.

Click here to see answer by Alan3354(69443)

Question 729845: how do I work such a problem as y=x^2-4x-9 to obtain x-intercepts on graph.
my answer is 2+√13 and 2-√13. Is this correct. Thank you for your help.
Click here to see answer by Alan3354(69443)

Question 729887: what is x+5y+4z?
x=7/8, y= 1/9, and z= -1/8
Click here to see answer by stanbon(75887)

Question 729898: Translate this sentence into an equation.

The sum of 22 and Victor's score is 62 .
Use the variable v to represent Victor's score.
Click here to see answer by fcabanski(1391)

Question 729909: solve the inequality
6s-10>2s-18
Click here to see answer by stanbon(75887)

Question 729983: i have always been taught the order of operations as PEMDAS p-parenthesis
e-exponent m-multiply d-divide a-add s- subtract, but when it comes to combining like terms in long equations that involve the order of operations, i get confused. can you explain an easier way to help me do equations like this:
-7(8y+9)-8y(7+-5) (i guess this can also be taken as an expression too.)
Click here to see answer by rfer(16322)

Question 729984: x equals what in 4x+4(7x-3)=-172
Click here to see answer by rfer(16322)

Question 729980: A lot is in the shape of a right triangle. The shorter leg measures 150m. The hypotenuse is 50m longer than the length of the longer leg. How long is the longer leg?
Click here to see answer by nerdybill(7384)

Question 729927: solve the inequality
x+3 is great than or = to -29.
Click here to see answer by checkley79(3341)

Question 730084: Mrs. Crews bought 4 pencils and 3 pens for $5.60... Mrs Henderson bought 2 pencils and 3 pens for $4.60 of the same kind... What is the price for each pen and pencil?
Click here to see answer by mananth(16946)

Question 730088: the perimeter of a rectangular field is 244 feet. if the length is 2 feet longer than its width, what are the dimensions of the field ?

Click here to see answer by rfer(16322)

Question 730129: Anthony invested a sum of money 7 years ago in a savings account that has since paid interest at the rate of 4%/year compounded quarterly. His investment is now worth $55,494.22. How much did he originally invest?

Click here to see answer by rfer(16322)

Question 730128: ind the effective rate corresponding to the given nominal rate. (Assume a 365-day year. Round your answer to two decimal places.)
7%/year compounded semiannually

Click here to see answer by lynnlo(4176)

Question 730413: 6c+4=22
i need it done before tomorrow please help
Click here to see answer by rfer(16322)

Question 730467: 9x-7=-7
Click here to see answer by rfer(16322)

Question 730515: d-2=21

Click here to see answer by rfer(16322)

Question 730587: celeste wants to have her haircut and permed and also go to lunch. she knows she will need $59. the perm costs twice as much as her haircut and she needs $5 for lunch. how much does the perm cost
Click here to see answer by rfer(16322)

Question 730543: x sqrd/49-y sqrd/81=1, what are the slopes of the asymptotes?
Click here to see answer by lwsshak3(11628)

Question 730777: Solve x
2(x+4)=24
Click here to see answer by josgarithmetic(39617)

Question 730855: Write each polynomial below in standard form and classify
3a^2+11a^3+3a^2-2a^3
Click here to see answer by jim_thompson5910(35256)

Question 731007: candice rakes leaves for her neighbors. She charges $4 per hour to rake leaves plus $7 to remove them. She uses the equation t=7+4h. How much will candice earn if she works for 3 hours and 15 minutes

Click here to see answer by fcabanski(1391)

Question 731023: if y is equal to 60 and x is equal to 1
then y is equal to 58 and x is equal to 2
then y is equal to 56 and x is equal to 3 and it follows in this linear pattern
what is the algrebriac expression for this fall on a line graph
I have just been teaching my year 6 basic algebra on a line graph e.g. y equal x and y equals x plus 2 but dont know how to answer this data probelm
Hope you can help?
Click here to see answer by KMST(5328)

Question 731253: 4x-19=5
Click here to see answer by rfer(16322)

Question 731309: 15m - 16 + m^2
how to solve
Click here to see answer by Alan3354(69443)

Question 731377: Choose the slop of the line 2x+5y=-1.
-1/5 or 2 or 2/5 or -2/5.
Please tell me how to do this.
Click here to see answer by josgarithmetic(39617)

Question 731512:
10 balls and 1 ball bag purchased for $155. 12 balls and 2 ball bags purchased
for $189. How much does 1 ball cost and how much does 1 ball bag cost?

Click here to see answer by checkley79(3341)

Question 731492:

Solve 21n^2-10=n
Click here to see answer by checkley79(3341)

Question 731645: How do you put the following word problem into two equations: A collection of dimes and quarters totals $9.90. There are six more quarters than dimes. How many of each coin are there?
Click here to see answer by ankor@dixie-net.com(22740)

Question 731742: what is the solution for: 6(2x-12)>12(45+1x) thanks for the help
Click here to see answer by Alan3354(69443)

Question 731708: combining like terms
2X+7X+4Y-2Y
Click here to see answer by lenny460(1073)

Question 731748: do the equations x=4y+1 and x=4y-1 have the same solution. How might you explain your answers to someone who has not learned algebra
Click here to see answer by lynnlo(4176)

Question 731753: Hi. I have spent a lot of time on this. Hopefully someone here can help me. I have been given this formula:
1/2g=g(R^2)/((R+h)^2)
The objective is to make h the subject and express it in terms of R.
I have been informed that the answer is h=((sqrt2)-1)R
How do I get to this? Thanks in advance
Click here to see answer by Alan3354(69443)

Question 731862: solve
2^x-4^(1/(2+x))+8^x = 0
Click here to see answer by Vladdroid(91)

Question 732064: 2.3y - 0.77 = - 2.144
I seem to be doing something wrong...
Click here to see answer by MathLover1(20849)

Question 732076: Write the equation of the line that has the indicated slope and contains the indicated point. Express the final equation in standard form.
m= -5, (3, 2)
Click here to see answer by josmiceli(19441)

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23941..23985, 23986..24030, 24031..24075, 24076..24120, 24121..24165, 24166..24210, 24211..24255, 24256..24300, 24301..24345, 24346..24390, 24391..24435, 24436..24480, 24481..24525, 24526..24570, 24571..24615, 24616..24660, 24661..24705, 24706..24750, 24751..24795, 24796..24840, 24841..24885, 24886..24930, 24931..24975, 24976..25020, 25021..25065, 25066..25110, 25111..25155, 25156..25200, 25201..25245, 25246..25290, 25291..25335, 25336..25380, 25381..25425, 25426..25470, 25471..25515, 25516..25560, 25561..25605, 25606..25650, 25651..25695, 25696..25740, 25741..25785, 25786..25830, 25831..25875, 25876..25920, 25921..25965, 25966..26010, 26011..26055, 26056..26100, 26101..26145, 26146..26190, 26191..26235, 26236..26280, 26281..26325, 26326..26370, 26371..26415, 26416..26460, 26461..26505, 26506..26550, 26551..26595, 26596..26640, 26641..26685, 26686..26730, 26731..26775, 26776..26820, 26821..26865, 26866..26910, 26911..26955, 26956..27000, 27001..27045, 27046..27090, 27091..27135, 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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