Questions on Algebra: Equations answered by real tutors!

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Question 1127673: find the formula for an exponential function that passes through (-1,4/3) and (4,324)
Click here to see answer by josgarithmetic(39617)

Question 1127673: find the formula for an exponential function that passes through (-1,4/3) and (4,324)
Click here to see answer by ikleyn(52781)

Question 1127693: find the formula for an exponential function that passes through the two points given.
a) (-1,1/2) and (4,512)
b) (-1,7) and (3,4)
Click here to see answer by greenestamps(13200)

Question 1127693: find the formula for an exponential function that passes through the two points given.
a) (-1,1/2) and (4,512)
b) (-1,7) and (3,4)
Click here to see answer by ikleyn(52781)

Question 1127722: Mary takes a sightseeing tour on a helicopter that can fly 414 miles against a 35 mph headwind in the same amount of time it can travel 666 miles with a 35 mph tailwind. Find the speed, in miles per hour, of the helicopter.
Click here to see answer by josgarithmetic(39617)

Question 1127856: 2,6,10,14,18,22,26,30,34,38, select any number of five that grand total is100??
Click here to see answer by MathLover1(20849)

Question 1127855: 2,6,10,14,18,22,26,30,34,38, select number of five that grand total is100??
Click here to see answer by ikleyn(52781)

Question 1127834: Two different mixtures of gasoline are available, one with 5% alcohol by volume and the other containing 12% alcohol. How many litres of the 12% mixture must be added to 765 L of the 5% mixture to produce a mixture containing 9%alcohol?
Click here to see answer by ikleyn(52781)

Question 1127860: A=1/2h(b1+b2) solve for b1
Click here to see answer by Boreal(15235)

Question 1127899: Find the values of b such that the equation below always gives real solutions.
-3x^2 + bx -1 = 0
Click here to see answer by ikleyn(52781)

Question 1127772: The lines represented by the equations y=-\frac{1}{2}x+6y=−
2
1

x+6 and 4y-8x=-204y−8x=−20 are

Click here to see answer by greenestamps(13200)

Question 1128026: 3.5= 3.2x3
�
h
Click here to see answer by ikleyn(52781)

Question 1128026: 3.5= 3.2x3
�
h
Click here to see answer by josgarithmetic(39617)

Question 1128033: 3.5=3.2x3/h
Click here to see answer by ikleyn(52781)

Question 1128029: 3.5=3.2x3/h
Click here to see answer by ikleyn(52781)

Question 1128082: Solve for a.
Q=a-b/2
Click here to see answer by MathLover1(20849)

Question 1128102: write the equation of the line in A.) slope intercept form B.) Standard form
No slope, through (-4,5)
A._____
B.)-____
Click here to see answer by Alan3354(69443)

Question 1128101: Graph by plotting the x and y intercepts (state the intercepts in coordinate form)
3x+2y=6
X-intercept___
Y-intercept___
Click here to see answer by Alan3354(69443)

Question 1128100: Find the slope. -3+2/3y=-x
Click here to see answer by Alan3354(69443)

Question 1128100: Find the slope. -3+2/3y=-x
Click here to see answer by MathLover1(20849)

Question 1128096: Write equation of the line in... A.) Slope-intercept form B.)Standard form
(-2,4) (0,-6)
Click here to see answer by Alan3354(69443)

Question 1128099: Equation of the line A.) Parallel and B.) Perpendicular to -8x-7y and through (-7,1)
Click here to see answer by josgarithmetic(39617)

Question 1128114: Use the compound interest formula Upper A equals Upper P left parenthesis 1 plus r right parenthesis Superscript t to find the annual interest
Click here to see answer by ikleyn(52781)

Question 1128139: Correct 28.7530 to 4 significant figures
Click here to see answer by josgarithmetic(39617)

Question 1128160: tan (sin^-1(x))
Click here to see answer by ikleyn(52781)

Question 1128170: A woman bought some large frames for $13 each and some small frames for $7 each at a closeout sale. If she bought 20 frames for $170,find how many of each type she bought.
Click here to see answer by josmiceli(19441)

Question 1128206: solve.
-(2y-3)-4(5-y)+8

I got the answer 2y-9
Click here to see answer by MathLover1(20849)

Question 1128216: a carpenter cuts 5-ft board in two pieces. one piece must be three times as long as the other. find the length of each piece.

Click here to see answer by Alan3354(69443)

Question 1128224: If (sqrt 3 - 1) is a root of the equation 2x^2-2kx+4 = 0, then k equals...
Click here to see answer by ikleyn(52781)

Question 1128224: If (sqrt 3 - 1) is a root of the equation 2x^2-2kx+4 = 0, then k equals...
Click here to see answer by josmiceli(19441)

Question 1128252: Use the given information to find the unknown value.
y varies jointly as the square of x and the square root of z. When x = 2 and z = 9, then y = 48.
Find y when x = 3 and z = 16.

Click here to see answer by josgarithmetic(39617)

Question 1128249: Write an equation describing the relationship of the given variables.
y varies jointly as x and the square root of z and when x = 8 and z = 49, then y = 840.
Click here to see answer by josgarithmetic(39617)

Question 1128250: Write an equation describing the relationship of the given variables.
y varies jointly as the square of x, the cube of z, and the square root of w. When x = 4, z = 2, and w = 9, then
y = 384.
Click here to see answer by josgarithmetic(39617)

Question 1128282: 2x-1/3x - 1/2
Click here to see answer by Quadratic1600(28)

Question 1128301: Simplify: (4m^3+2m^2-8m+2) + (8m^2-4)

i got 4m^3+10m^2-8m-2
Click here to see answer by Quadratic1600(28)

Question 1128191: trinity has $10 gift cards to the music store. She chose a number of cd's from a $7 bargain bin. If the cost of the cd's is 32 how many cd's did trinity have to buy

Click here to see answer by Alan3354(69443)

Question 1128290: Write an equation describing the relationship of the given variables.
y varies jointly as the square of x, the cube of z, and the square root of w. When x = 4, z = 2, and w = 9, then y = 384.
*Following another�s advice of subsuiting each Constant into the corresponding variable place, my answers are still incorrect. My answer so far have been y= x^2� z^3� sqrt(w). y= 4^2� 2^3� sqrt (9).
Y= 384/ 4^2�2^3� sqrt(9). Can someone explain what I am doing incorrect in setting up the above equation.
Click here to see answer by MathLover1(20849)

Question 1128312: solve
10(2n+1)-6=20(n-1)+12
Click here to see answer by Quadratic1600(28)

Question 1128312: solve
10(2n+1)-6=20(n-1)+12
Click here to see answer by josgarithmetic(39617)

Question 1128271: In a girl's boutique, Abby and Mary Ann work in the embroidery section. They finish a certain job if Abby and Mary Ann works for 3 days or if they work together for 6 days.How long will it take each to do the job alone?
Click here to see answer by ankor@dixie-net.com(22740)

Question 1128283: Write an equation describing the relationship of the given variables.
y varies jointly as x and the square root of z and when x = 8 and z = 49,then y = 840.
*I know that the formula is z=kyx, but every time I go plug in the variables in each appropriate place the answers are wrong. My answers so far have been k= 840/ 8 sqrt(49), k=840/ 8 sqrt(7), and y= 840/ 8 sqrt(49). If someone can help explaining how to correctly set up joint variation equation, it would be greatly appreciated. Thanks.
Click here to see answer by ankor@dixie-net.com(22740)

Question 1128365: -7.4=8.8+x whats x

Click here to see answer by MathLover1(20849)

Question 1128326: Given that a+b=c, a+c=d, and b=c+d, where d is a positive integer, what is the greatest value of a?
A)-3 B)2 C)-2 D)1 E)-1

Click here to see answer by greenestamps(13200)

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7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 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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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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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