Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 209090: 11. At t=0 seconds, Vikki stood on the roof of a building and threw a penny in the air. The height in feet h(t) of the ball at t seconds is given by the formula
H(t) = -16t2 + 96t +56
a) How tall is the building (hint: t=0)
b) When is the ball at its highest point?
c) To what height does the ball travel?
d) When does the ball strike the ground?

Click here to see answer by Alan3354(69443)

Question 209093: m4-13m2+36=0
hint x=m2
Im confused and need help
Click here to see answer by RAY100(1637)

Question 209162: I need help please, solving this equation 11x^2+20x-39
Click here to see answer by Alan3354(69443)

Question 209162: I need help please, solving this equation 11x^2+20x-39
Click here to see answer by stanbon(75887)

Question 209135: Solve 9x^4-21x^2+10 = 0
Give an exact answer, using radicals as needed.
I think to start this problem off I need to factor but I'm not sure how to do that on this equation. Please help.
Click here to see answer by scott8148(6628)

Question 209264: Hi I need help solving this problem in College Algebra B. I have this on my test and need to know how to work it out. So Please show me the steps as wll as the snswers. I am so lost on this I don't know were to being.
Simplify; express answer with only positive exponents.
(x-^3y^3)/(3y^-3)^2

Click here to see answer by Alan3354(69443)

Question 209364: How do you solve x^2-8x+17=0
Click here to see answer by Alan3354(69443)

Question 209416: solve by completing square 4 x^2 - 8x - 2 = 0
Click here to see answer by Earlsdon(6294)

Question 209416: solve by completing square 4 x^2 - 8x - 2 = 0
Click here to see answer by RAY100(1637)

Question 209449: If a penny is thrown downward at 30 ft/sec
from the bridge at Royal Gorge, Colorado, how long does it
take to reach the Arkansas River 1000 ft below?
It says to use the quadratic equation.

x^2-〖30〗^2=〖1000〗^2
I have work started but it's not pasting into here.
It's from my online textbook, I cannot find the ISBN.

Click here to see answer by Alan3354(69443)

Question 209451: Harry and Gary are traveling to Nashville
to make their fortunes. Harry leaves on the train at 8:00 A.M.
and Gary travels by car, starting at 9:00 A.M. To complete
the 300-mile trip and arrive at the same time as Harry, Gary
travels 10 miles per hour (mph) faster than the train. At
what time will they both arrive in Nashville?

I am supposed to use the quadratic equation, but this is all I have come up with.
300/8x=300/(9x+10)
Click here to see answer by stanbon(75887)

Question 209463: I need help sovling this problem. I need steps in words as well as the math. Please help I nee to know how to do this.
(81a^12 b^16)^-1/2
Click here to see answer by stanbon(75887)

Question 209498: write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form, ax^2+bx+c=0.
Solution:9, only solution
Click here to see answer by stanbon(75887)

Question 208985: Can you solve this (c-4)^2 = 5
Click here to see answer by RAY100(1637)

Question 208462: 7/2x-1=2x+5
Click here to see answer by checkley77(12844)

Question 208462: 7/2x-1=2x+5
Click here to see answer by MathTherapy(10549)

Question 209591: 16x+12x=7 quadratic formula
Click here to see answer by Earlsdon(6294)

Question 209629: can some one help me solve this and tell me how you got the answer.Please need this right away! THANK YOU
(-x)^3/5
Click here to see answer by stanbon(75887)

Question 209617: i have no idea how to even begin this problem. Any help is appreciated!
Use the quadratic formula to determine the x-intercepts (if any) of the following function. Then evaluate the function for several values of x, and use the resulting points to graph the function.

f(x) = -2x2 + 2x - 9

Click here to see answer by Alan3354(69443)

Question 209622: Solve the following systems of equations:

x + 2y = 6 (1)
x = 8-2 y (2)

Click here to see answer by Alan3354(69443)

Question 208418: 1/2 x + 5/6 = 1- 2/3 x get the x value that is equal to
Click here to see answer by ankor@dixie-net.com(22740)

Question 209651: I have no idea how to solve this. I am probably making it harder then it is. Can someone please help me?
Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and train B is traveling at 125 miles per hour. Train A passes a station at 12.25 P.M. If train B passes the same station at 12:37, at what time will train B catch up to train A? ______?

Click here to see answer by checkley77(12844)

Question 209639: Please help!

Solve by elimination method:

4x+ 5y = 2
8x + 10y = 4
Either the solution is an ordered pair (____,____)
or
there are infinitely many solutions ____

Click here to see answer by checkley77(12844)

Question 209614: Help please!
Let f(x) = x2 - 8x + 16. Find x so that f(x) = 22
Click here to see answer by nerdybill(7384)

Question 209635: There is a two-digit number such that the sum of its digits is 6, while the product of the digits is 1/3 the original number. Find this number.
Click here to see answer by checkley77(12844)

Question 209637: A rectangular tank can be filled with water by two pipes in 11-1/9 minutes. If the larger pipe alone takes 5 minutes less to fill the tank than the smaller pipe,find the time each pipe takes to fill the tank.
Click here to see answer by ankor@dixie-net.com(22740)

Question 209698: Bill can row 3 mph in still water. It takes him 3 hours 36 minutes to go 3 miles upstream and return. Find the speed of the current.
I've gone over and over trying this problem different ways. I've converted the time into 216 minutes and still can't figure out what I'm doing wrong.
Click here to see answer by Alan3354(69443)

Question 209753: the manager of farmers delight bought a load of watermelons for $750 and priced the watermelons so that he would make $2 on each melon. when all but 100 of the melons had been sold, he broke even. how many did he originally buy?
Click here to see answer by 314(4)

Question 209757: Solve by using quadratic formula: 4x squared minus 4 x equals -15.
Click here to see answer by jim_thompson5910(35256)

Question 209704: I need help expressing the following quadratic expression in factored from by using the quadratic formula : x^2-2ax+a^2-b^2
Click here to see answer by jim_thompson5910(35256)

Question 209831: Write the extremes and means of the proportion:
2/6 = 1/3
i do not understand how to answer this quention.
Click here to see answer by nyc_function(2741)

Question 209809: I have a word problem I need help figering out. I need help on it asap. Please explain how you got the answer.
Looking out on the balcony of a cabin I see a lake were I can go fishing. My cabin balcony is on the 3rd floor. Using formula d=√[3h/2]. I want to find how far away the lake is from my cabin. I say I am about 36 feet up.
Click here to see answer by nyc_function(2741)

Question 209862: I need to solve for x using the quadratic equation. The problem is... "(5/(w^2))-(10/w)+2=0. I need to solve for x, I need more than an answer, I need the steps.
Click here to see answer by stanbon(75887)

Question 210011: High concentrations of Carbon Monoxide (CO) can cause coma and possible death. The time required for a person to reach a COHb level capable of causing a coma can be approximated by the quadratic model. T=.0002x^2 - .316x + 127.9, where T is the exposure time in hours necessary to reach this level and 500<= x <=800 is the amount of carbon monoxide present in the air in parts per million (ppm).
Estimate the approximate concentration of (CO) necessary to produce a coma in 4 hrs?.
Click here to see answer by stanbon(75887)

Question 210045: A rocket is launched from atop a 43-foot cliff with an initial velocity of 70 feet per second. The height of the rocket t seconds after launch is given by the equation h = -16t^2 + 70t + 43. Graph the equation to find out how long after the rocket is launched it ill hit the ground. Estimate your answer to the nearest tenth of a second.
Click here to see answer by Alan3354(69443)

Question 210149: Is this correct?

x = 25 +-Square root -23i over 6?
Click here to see answer by jim_thompson5910(35256)

Question 210159: solve 3x^2-7x-6=0
Click here to see answer by jim_thompson5910(35256)

Question 210170: The mat around a picture measures (x) inches across. The mat is 37 inches long and 24 inches wide. The area of the picture itself is 300 square inches. set up an equation that expresses the area of the picture in terms of the thickness of the mat, (x).
My answer is (37-x)(24-x)=300, but i dont think its right.
Click here to see answer by scott8148(6628)

Question 210176: 3/4 -1/3z = 1/4
Click here to see answer by stanbon(75887)

Question 210187: solve by factoring z^2-5z-14=0
Click here to see answer by jim_thompson5910(35256)

Question 210195: An object is moving in a straight line. It initially travels at a speed of 9 meters per second, and it speeds up at a constant rate of 2 meters per second each second. Under such conditions, the distance d, in meters, that the object travels is given by the equation d = t^2 + 9t, where t is in seconds. According to this equation, how long will it take the object to travel 22 meters?
Click here to see answer by Alan3354(69443)

Question 210198: An object is launched straight up into the air at an initial velocity of 64 feet per second. It is launched from a height of 6 feet off the ground. Its height H, in feet, at t seconds is given by the equation H = -16t^2 + 64t + 6. Find all times t that the object is at a height of 54 feet off the ground.
Click here to see answer by Alan3354(69443)

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, 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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