Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 990875: 6=7x+x

Click here to see answer by macston(5194)

Question 990892: 16.3(1/t)+16.3(1/2.13t)=1
Click here to see answer by Alan3354(69443)

Question 991052: 60+60x0-1=
Click here to see answer by ikleyn(52776)

Question 991099: Solve for m:
x = mp/c
The book's answer was m = xc/p
Just to make sure I did it right, here it is:
x = mp/c
x/mx = mx . c/mp
m = xc/p
Is this correct?

Click here to see answer by Fombitz(32388)

Question 991207: The sale Price S (in dollars) of an item is given by the formula S=L - rL, where L is the lost price (in dollars) and r is the discount rate (in decimal form)
a. Solve the formula for r

Click here to see answer by stanbon(75887)

Question 991167: f(t) = sin(t)
Find the exact values for the derivative f at the given numbers.
f ' (10pi/3)
f ' (11pi/4)

Thank you
Click here to see answer by Alan3354(69443)

Question 991222: Determine the standard form of the equation of the line that passes through (0,5) and (4,0)
a. -5x + 4y = -20
b. -5x - 4y = 20
c. 5x + 4y = 20
d. 4x - 5y = -20
Click here to see answer by josgarithmetic(39616)

Question 991268: The area of a rectangle is 42. If the length is X and the width is X + 1, what is x?
Click here to see answer by ikleyn(52776)

Question 991174: Why is it useful to rewrite a formula in terms of another variable

Click here to see answer by solver91311(24713)

Question 991230: let x and y be positive and x >1, 11^x/11^y
Click here to see answer by solver91311(24713)

Question 991130: Sarah Saved 2 Dollars for every 5 dollars her brother saves. If Sarah saved 20 dollars how much does her brother have.
2 / 5 = 40 / x. X=100
Click here to see answer by Theo(13342)

Question 991101: A family has two cars. The first car has a fuel efficiency of 15 miles per gallon of gas and the second has a fuel efficiency of 40 miles per gallon of gas. During one particular week, the two cars went a combined total of 2000 miles, for a total gas consumption of 75 gallons. How many gallons were consumed by each of the two cars that week?
Click here to see answer by Theo(13342)

Question 991309: Hello, could you please show the steps and answer for s in the equation
3s + 5 = -21
Thank you,Peggy
Click here to see answer by farohw(175)

Question 991349: I am trying to help my grandson get caught up in online school Algebra but I don't know algebra. Can you show me how to rewrite a couple of problems that I have so that I can solve them and then sub other problems to get the hang of it?
Click here to see answer by macston(5194)

Question 991364: Let
(a). Find at (1,0)
(b). Write the equation of the tangent line to the graph at (1,0)

Thank you
Click here to see answer by Fombitz(32388)

Question 991362: Find (Does not need to simplifited, just show the first step)
(a).
(b).
(c).
(d).

Please give details
Thank you
Click here to see answer by ikleyn(52776)

Question 991453: Solve for x 5^32=5^2x
Click here to see answer by Alan3354(69443)

Question 991462: 5x - 6 = 3 - 4x
Click here to see answer by jim_thompson5910(35256)

Question 991479: X+1.9=5
Click here to see answer by EdenWolf(517)

Question 991451: Negative 7 times positive 3 equal 8 times negative 3
Click here to see answer by EdenWolf(517)

Question 989922: Negative One times the sum of twice a number and 3 is equal to two times the difference of Negative Four times the number And 3. what is the number?
Click here to see answer by EdenWolf(517)

Question 991480: I need to find out how to solve a two variables equations cause I am having a very hard time trying to figure out what to do with both variables.
a+18=7a

3w+6=4w
Click here to see answer by rothauserc(4718)

Question 989445: Direction: Solve. Identify equations that are identities or that have no solution.
Problem: 3x=9x
Click here to see answer by EdenWolf(517)

Question 989445: Direction: Solve. Identify equations that are identities or that have no solution.
Problem: 3x=9x
Click here to see answer by ikleyn(52776)

Question 991434: 4 (-4) / (-8) 6 = -3 + 5(3)
On the textbook it says that it is false
Click here to see answer by josgarithmetic(39616)

Question 991529: F=g(m1m2/d^2) solve the formula for m1
Click here to see answer by ikleyn(52776)

Question 991545: A number is written as 37 in base x. Twice the number is written as 75 in base x. Fine the value of x
THANK YOU
Click here to see answer by Timnewman(323)

Question 991582: For this Exercise, assume that a linear equation models each situation.
Cell-Phone Charges. The total cost of Tam's cell phone was $410 after 5 months of service and $690 after 9 months. What costs had Tam already incurred when her service just began? Assume that Tam's monthly charge is constant.
My answer was $70. The book's answer was $60. Am I right or wrong? Please help me if I'm wrong.
Click here to see answer by rothauserc(4718)

Question 991667: Four less than a number is 19
Click here to see answer by ikleyn(52776)

Question 991681: What is the error in the equation:
2x-3(3y=4)=2x-3y+4
Click here to see answer by macston(5194)

Question 991699: How do you factor:
x^3+2x^2-x-2
Click here to see answer by MathLover1(20849)

Question 991775: Solve the following equation and check your solution -4x=16
Click here to see answer by MathLover1(20849)

Question 991784: 2(4z-1)=3(z+2) How do I solve this problem?
Click here to see answer by farohw(175)

Question 991714: 4y-8x=-16
Click here to see answer by farohw(175)

Question 991757: the length of a rectangle is 2 more than 3 times the width.if the perimeter is 92 find the dimensions of the rectangle

Click here to see answer by macston(5194)

Question 991756: find three consecutive odd integers such that the sum of the middle and the largest inteer is 21 more than the smallest integer
Click here to see answer by macston(5194)

Question 991843: maria and tim sold candy bars for a fundraiser.maria sold 7 less than twice the number of candy bars that tim sold. in total ,maria and tim sold 137 candy bars.find the amount of candy bars sold by each.
Click here to see answer by 18leunggn2(1)

Question 991861: x + 3/3 - 3x - 12/5 = 1
Click here to see answer by Alan3354(69443)

Question 991985: Joden just moved into a 12-story apartment building, and he is still having trouble finding which floor he lives on. He knows that he lives in the first apartment on the floor, but doesn�t know which floor. He starts by going to the first floor and knocks on the door. Mrs. SMith answers and tells him to go up 8 floors and ask Mr. Jones. Joden does that and asks Mr. Jones where he lives. Mr. JOnes doesn�t know, but he says, �Go down 2 floors to Bryn�s apartment and ask him.� Bryn didn�t know either. He told Joden to go up 5 floors to see his friend Trudie, because she knows where everyone lives. Trudie had no clue who Joden was. She said that the only one who might know where he lived was the new guy 7 floors below her. Joden goes down 7 floors and knocks on the new guy�s apartment. No one answers. He stands there thinking for a while and finally realizes that he is the new guy. He opens the door and walks in the apartment. Which floor does Joden live on?
Click here to see answer by macston(5194)

Question 992018: a department store manager decided to mix cashew and pecans to get 400 kg of nuts to sell for $3.36/kg. if cashews sell for $3.20/kg and pecans $ 3.6/kg how many kilograms of each type of nut did he use
Click here to see answer by josgarithmetic(39616)

Question 992022: Please help me solve: w-c/w-d = c^2/d^2 (for w)
Click here to see answer by rothauserc(4718)

Question 992058: Please help solve this
4n + 5 = 6n + 7
Click here to see answer by macston(5194)

Question 992071: I'm having a hard time figuring this out.
Thank you in advance.
I need to solve this:
5/(x+1) = 2/(x-3)
Click here to see answer by josmiceli(19441)

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11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 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20746..20790, 20791..20835, 20836..20880, 20881..20925, 20926..20970, 20971..21015, 21016..21060, 21061..21105, 21106..21150, 21151..21195, 21196..21240, 21241..21285, 21286..21330, 21331..21375, 21376..21420, 21421..21465, 21466..21510, 21511..21555, 21556..21600, 21601..21645, 21646..21690, 21691..21735, 21736..21780, 21781..21825, 21826..21870, 21871..21915, 21916..21960, 21961..22005, 22006..22050, 22051..22095, 22096..22140, 22141..22185, 22186..22230, 22231..22275, 22276..22320, 22321..22365, 22366..22410, 22411..22455, 22456..22500, 22501..22545, 22546..22590, 22591..22635, 22636..22680, 22681..22725, 22726..22770, 22771..22815, 22816..22860, 22861..22905, 22906..22950, 22951..22995, 22996..23040, 23041..23085, 23086..23130, 23131..23175, 23176..23220, 23221..23265, 23266..23310, 23311..23355, 23356..23400, 23401..23445, 23446..23490, 23491..23535, 23536..23580, 23581..23625, 23626..23670, 23671..23715, 23716..23760, 23761..23805, 23806..23850, 23851..23895, 23896..23940, 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, 27136..27180, 27181..27225, 27226..27270, 27271..27315, 27316..27360, 27361..27405, 27406..27450, 27451..27495, 27496..27540, 27541..27585, 27586..27630, 27631..27675, 27676..27720, 27721..27765, 27766..27810, 27811..27855, 27856..27900, 27901..27945, 27946..27990, 27991..28035, 28036..28080, 28081..28125, 28126..28170, 28171..28215, 28216..28260, 28261..28305, 28306..28350, 28351..28395, 28396..28440, 28441..28485, 28486..28530, 28531..28575, 28576..28620, 28621..28665, 28666..28710, 28711..28755, 28756..28800, 28801..28845, 28846..28890, 28891..28935, 28936..28980, 28981..29025, 29026..29070, 29071..29115, 29116..29160, 29161..29205, 29206..29250, 29251..29295, 29296..29340, 29341..29385, 29386..29430, 29431..29475, 29476..29520, 29521..29565, 29566..29610, 29611..29655, 29656..29700, 29701..29745, 29746..29790, 29791..29835, 29836..29880, 29881..29925, 29926..29970, 29971..30015, 30016..30060, 30061..30105, 30106..30150, 30151..30195, 30196..30240, 30241..30285, 30286..30330, 30331..30375, 30376..30420, 30421..30465, 30466..30510, 30511..30555, 30556..30600, 30601..30645, 30646..30690, 30691..30735, 30736..30780, 30781..30825, 30826..30870, 30871..30915, 30916..30960, 30961..31005, 31006..31050, 31051..31095, 31096..31140, 31141..31185, 31186..31230, 31231..31275, 31276..31320, 31321..31365, 31366..31410, 31411..31455, 31456..31500, 31501..31545, 31546..31590, 31591..31635, 31636..31680, 31681..31725, 31726..31770, 31771..31815, 31816..31860, 31861..31905, 31906..31950, 31951..31995, 31996..32040, 32041..32085, 32086..32130, 32131..32175, 32176..32220, 32221..32265, 32266..32310, 32311..32355, 32356..32400, 32401..32445, 32446..32490, 32491..32535, 32536..32580, 32581..32625, 32626..32670, 32671..32715, 32716..32760, 32761..32805, 32806..32850, 32851..32895, 32896..32940, 32941..32985, 32986..33030, 33031..33075, 33076..33120, 33121..33165, 33166..33210, 33211..33255, 33256..33300, 33301..33345, 33346..33390, 33391..33435, 33436..33480, 33481..33525, 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