Questions on Algebra: Equations answered by real tutors!

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Question 196736: I need help to find the beginning equation the following word problem-Junior's boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of the current?
Click here to see answer by stanbon(57219)

Question 196738: Please help me with this problem
Solve by using quadric formula x^2+8x=3 We substitute a=1, b=8 and c=3

Click here to see answer by Mathtut(3670)

Question 196770: 2/3y = 5
Click here to see answer by RAY100(1637)

Question 196790: 3/4t - 7/12= 1/6
Click here to see answer by Edwin McCravy(8879)

Question 196790: 3/4t - 7/12= 1/6
Click here to see answer by jim_thompson5910(28476)

Question 196692: I'm coming up with the incorrect answer to the following problem. Can you assist me?
A large pond is stocked with fish. The fish population P is modeled by the formula P = 4t + 8√t + 110, where t is the number of days since the fish were first introduced into the pond. How many days will it take for the fish population to reach 500?
thanks!
Click here to see answer by scott8148(6628)

Question 196830: 12x=4x-16
Click here to see answer by jim_thompson5910(28476)

Question 196830: 12x=4x-16
Click here to see answer by Mathtut(3670)

Question 196828: I'm having some trouble with this interval. I came up with the answer: (-INFINITY,-8) but it comes up that -INFINITY is incorrect. Can you help me?
-3x+16<-6x-8
thanks!
Click here to see answer by Mathtut(3670)

Question 196827: I'm having some trouble with this interval. I came up with the answer: (-INFINITY,-8) but it comes up that -INFINITY is incorrect. Can you help me?
-3x+16<-6x-8
thanks!
Click here to see answer by Mathtut(3670)

Question 196819: Hello!
I've been having some trouble with the following word problem
A large pond is stocked with fish. The fish population P is modeled by the formula P = 4t + 8√t + 110, where t is the number of days since the fish were first introduced into the pond. How many days will it take for the fish population to reach 500?
thanks!
Click here to see answer by jim_thompson5910(28476)

Question 196847: Solve for r: 3r-4=4(r-3)
Click here to see answer by jim_thompson5910(28476)

Question 196846: Solve for y: 5y-20=10
Click here to see answer by jim_thompson5910(28476)

Question 196850: solve for x: 0.3x+3=30
Click here to see answer by jim_thompson5910(28476)

Question 196851: Express the sum of a over 3 and a over 4 as a single fraction in simplest form.
Click here to see answer by checkley77(12569)

Question 196855: Solve for y: 9 over y+1 equals 3/5.
Click here to see answer by ankor@dixie-net.com(15624)

Question 196882: ((3x+2)/4)=(9/4)-((3-2x)/6)
Click here to see answer by jim_thompson5910(28476)

Question 196903: x+y=5; let x=4
Click here to see answer by Mathtut(3670)

Question 196925: Factor: 16x²-81
Click here to see answer by jim_thompson5910(28476)

Question 196927: Subtract -x+y from 3x+y
Click here to see answer by mathsteacher(28)

Question 196927: Subtract -x+y from 3x+y
Click here to see answer by jim_thompson5910(28476)

Question 196952: I need help simplifying this equation.
2(5q-3)+(7q-1)-4(q-1)
Click here to see answer by user_dude2008(1861)

Question 196937: I know I have to get the variable by itself, but I can't figure out how.

Click here to see answer by Edwin McCravy(8879)

Question 197002: Please find the area of the circle. The diameter is 12 inches. Use A= pie r squared.

thank you
Click here to see answer by Alan3354(30959)

Question 197010: please help solve

3(2c-3)-2(-3c-3)=45

thank you
Click here to see answer by jim_thompson5910(28476)

Question 197020: If x represents an even integer, which expression also represents an even integer?
1. 2x+1
2. 2x
3. x+1
4. x-1
Click here to see answer by Edwin McCravy(8879)

Question 197037: please solve this equation.

1 over 5(x-120)=-34

thank you
Click here to see answer by jim_thompson5910(28476)

Question 197031: 1. write an equation y=kz
when x=2 y=6
k=
equation=
find y if x=4

Click here to see answer by anantha(86)

Question 197044: 4 times a number decreased by 11 is 25. Find the number

4x-11=25------(1)
or 4x-11+11=25+11------(2)
==> 4x=36
==>
Click here to see answer by mathsteacher(28)

Question 197058: I'm trying to solve an equation for 4y+3=11?
Click here to see answer by nerdybill(6948)

Question 197049: A=1/2(B+b)h solve for B
Please help with the above question...i just cant get it started
Click here to see answer by nerdybill(6948)

Question 197059: Hi! I've come up with one point for the following problem but the other problem t says its incorrect. Can you check this problem for me?
Find the point that is one-fourth of the distance from the point P(-7, 3) to the point Q(7, 2) along the segment PQ.
Click here to see answer by solver91311(16868)

Question 197060: what is
6m-4n+3m-2n
please im so stuck
Click here to see answer by Mathtut(3670)

Question 197032: 2. write an equation using z=kxz
x=-3, y=6, z=18
k=
equation=
find z if x=4, y=7
Click here to see answer by Mathtut(3670)

Question 197056: I'm having some trouble with the following problem, I think I'm missing a step somewhere.
Find the lengths of the medians of the triangle with vertices A(1, 3), B(3, 5), and C(7, 1). (A median is a line segment from a vertex to the midpoint of the opposite side.) Give your answers correct to one decimal place.
?=units (length of median AA')
?=units (length of median BB')
?=units (length of median CC')
thanks!
Click here to see answer by solver91311(16868)

Question 196971: Jim's nephew owns a triangular plot of land. The perimeter fence that surrounds the land measures 121 feet. The shortest side is 15 feet longer than one-half of the longest side. The second longest side is 4 feet shorter than the longest side. What is the length of each side?
I don't know where to start to make it into a equation.
Click here to see answer by ankor@dixie-net.com(15624)

Question 197083: if f(x)=x^2 and g(x)=x-3 find (fog)(0)
Click here to see answer by Mathtut(3670)

Question 197082: if f(x)=4-3x, find f^-1(-41)
Click here to see answer by Mathtut(3670)

Question 197081: if f(x)=4-3x, find f^-1(-41)
Click here to see answer by Mathtut(3670)

Question 197080: (2x+8)^1/2-8=0
Click here to see answer by Mathtut(3670)

Question 197086: A local hamburger shop sold a combined total of 502 hamburgers and cheeseburgers on Sunday. There were 52 more cheeseburgers sold than hamburgers. How many hamburgers were sold on Sunday?
let hb be the number of hamburgers and cb be the number of cheeseburgers
-------(1)
-------(2)
or
--------(3)
from (1), ------(4)
substitute (4) in (3)

therefore,
number of hamburgers = 225

Click here to see answer by mathsteacher(28)

Question 197135: 95 more than double a number is -15. Find the number.

thank you
Click here to see answer by edjones(7569)

Question 197145: The sum of two consecutive integers is 77. Find the numbers.

thank you
Click here to see answer by stanbon(57219)

Question 197147: please solve

5(1+2p)= -15 over 3

thank you
Click here to see answer by edjones(7569)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 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, 17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180, 18181..18225, 18226..18270, 18271..18315, 18316..18360, 18361..18405, 18406..18450, 18451..18495, 18496..18540, 18541..18585, 18586..18630, 18631..18675, 18676..18720, 18721..18765, 18766..18810, 18811..18855, 18856..18900, 18901..18945, 18946..18990, 18991..19035, 19036..19080, 19081..19125, 19126..19170, 19171..19215, 19216..19260, 19261..19305, 19306..19350, 19351..19395, 19396..19440, 19441..19485, 19486..19530, 19531..19575, 19576..19620, 19621..19665, 19666..19710, 19711..19755, 19756..19800, 19801..19845, 19846..19890, 19891..19935, 19936..19980, 19981..20025, 20026..20070, 20071..20115, 20116..20160, 20161..20205, 20206..20250, 20251..20295, 20296..20340, 20341..20385, 20386..20430, 20431..20475, 20476..20520, 20521..20565, 20566..20610, 20611..20655, 20656..20700, 20701..20745, 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