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Question 1161251: Nine boys and twelve girls have signed up for a trip. Only six students will be selected to go on the trip. Determine the probability that only boys will end up on the trip.
Thank you in advance for any help:)
I think the answer is : 0.08%
Click here to see answer by math_helper(2461)

Question 1161261: An object is thrown downward with an initial velocity of 7 feet per second. The relationship between the distance s it travels and time t is given by s=7t+16t^2. How long does it take the object to fall 78 feet?
Click here to see answer by math_helper(2461)

Question 1161263: Let f(x)=x^2 and g(x)=x+3, find:
a. (f o g)(x)=
b. (g o f)(x)=
c. (f o g)(-3)=
d. (g o f)(-3)=
Click here to see answer by MathLover1(20849)

Question 1161290: Find the quadratic equation for the height of the arch of a bridge
using the flowing facts: the horizontal length of the arch (from side
to side) is 2000 feet, the lowest part of the arch (on the far left
and far right) is 400 feet high, and the highest part of the arch (in
the center) is 1500 feet high. Let x be the horizontal distance from
the highest part of the arch and y be the height of the arch.
The equation is in the form
y=ax^2+b:
What is the value of a?
Give answer to four decimal places.
What is the value of b?
Click here to see answer by greenestamps(13195)

Question 1161300: The population of a town is modelled by the function P=6t^2+110t+4000
Where P is the population and t is the time in years since 2000.
a) What will the population be in 2020?
b) When will the population be 6000?
Click here to see answer by josgarithmetic(39614)

Question 1161282: The height of a telephone line is given by the equation
h=x^2/7 +55, where h is the height of the telephone line and x is the
distance from the lowest part of the line to a telephone pole. If the
line hooks onto the pole at a height of 250 feet, what is the distance
between the two poles? Give answer to the nearest hundredth.
Click here to see answer by ikleyn(52756)

Question 1161309: How long does it take for an amount of money P to double itself if it's invested at 7% interest compounded 4 times a year? Round your answer to 2 decimal places.
Click here to see answer by josgarithmetic(39614)

Question 1161308: Suppose that the population in a small city is 39,000 in the beginning of 2012 and the city council assumes that the population size t years later can be estimated by the equation
P=39,000e^0.09t
Approximately when will the city have a population of 60,000?
Click here to see answer by Theo(13342)

Question 1161310: Find the sum of the infinite geometric series:
4/3−1/3+1/12−1/48 +...
Click here to see answer by Edwin McCravy(20054)

Question 1161321: in two or more sentences compare the number of x intercepts in the graph of f(t) = t^2 to the number of x intercepts in the graph of g(t) = (t-8) ^2. be sure to include the transformations that occurred between the parent function f(t) and its image g(t)
Click here to see answer by Theo(13342)

Question 1161322: The following problem refers to a geometric sequence:
Given a_9=781250 and a_12=97656250, find r
Click here to see answer by MathLover1(20849)

Question 1161364: Find a_65 for the arithmetic sequence: 9,5,1,−3...
Click here to see answer by ikleyn(52756)

Question 1161364: Find a_65 for the arithmetic sequence: 9,5,1,−3...
Click here to see answer by MathLover1(20849)

Question 1161281: A person needed a new rain spout, but instead of buying one, she
decided to make her own by bending up an equal amount on both sides
of a piece of sheet metal. If the sheet metal was 20 inches long,
how much would she have to bend up on both sides so that the area
would be 50 square inches? If you have two answers, type in the larger
of your answers.
Click here to see answer by KMST(5328)

Question 1161407: my question is Create an example of a quadratic equation that can be factored and solved with non-integer solutions. what would i use? and how would i apply to make this question?

Click here to see answer by ikleyn(52756)

Question 1161596: A kicker starts a football game by "kicking off". The quadratic function y = -6x 2 + 12x models the football's height after x seconds. How long, in seconds, is the football in the air?
Click here to see answer by greenestamps(13195)

Question 1161597: A golfer hits the golf ball. The quadratic y = -13x^2 + 65x gives the time x seconds when the golf ball is at height 0 feet. In total, how long is the golf ball in the air?
Click here to see answer by Boreal(15235)

Question 1161652: A woman worked part-time certain number of days, receiving for her pay
$ 1800. If she had received $ 10 per day less than she did, she would
have had to work 3 days longer to earn the same sum. How many days
did she work?
Click here to see answer by josgarithmetic(39614)

Question 1161672: for the function f(x)=6x^2-2x-2 evaluate and fully simplify each of the following:
f(x+h)=
f(x+h)-f(x)/h =
Click here to see answer by solver91311(24713)

Question 1161730: Speed of Sound Formula to determine temperature of molten steel is:
s(t) = 1087.7*sqrt((9t+2617)/2457)
Would like to see steps to solve the above equation for "t"
Thanks very much.
Click here to see answer by josgarithmetic(39614)

Question 1161830: a ball is thrown from an initial height of 4 feet with an initial velocity of 35 ft/s. the balls height h in feet and t in seconds is given by the following
h=4+35t-16t^2
find all values of t for which the height is 22 feet.
Click here to see answer by Alan3354(69443)

Question 1162005: x²+(x-7)²=13²
Click here to see answer by ikleyn(52756)

Question 1162006: Find the numbers whose sum is 27 and product is 182.

Ans:let the numbers are x and (27-x).ect..............

In this case why we are taking (27-x)
Click here to see answer by Edwin McCravy(20054)

Question 1162180: determine k such that g(x)=3x^2+8x+k intersects f(x)=2x-1 at ine point.
Click here to see answer by Boreal(15235)

Question 1162180: determine k such that g(x)=3x^2+8x+k intersects f(x)=2x-1 at ine point.
Click here to see answer by ikleyn(52756)

Question 1162223: What is the equation of the quadratic function that has a minimum at (7,-3) and goes through (9,9)?
Click here to see answer by Edwin McCravy(20054)

Question 1162235: The product of two consecutive integers is 10920. Determine a quadratic model that would allow you to determine the two integers.
Do not solve.
Click here to see answer by ankor@dixie-net.com(22740)

Question 1162284: 2x^2+7xy+3y^2+9x+7y+4

Can someone help with this question.
Thanks in advance
Click here to see answer by Alan3354(69443)

Question 1162410: The total profit made by a social club by putting on a concert is modelled by P = 950c - 9.5c^2, where P is the profit, in dollars, and c is the price of the tickets, in dollars. What ticket price would result in no profit?

Click here to see answer by ikleyn(52756)

Question 1162411: At the national spitting competition contestants were lined up on top of a tall building. The winning projectile was projected off the top of the building in a trajectory defined by the equation where height(h) in metres and time (x) in seconds. h=-4.9(x-3)^2 + 82

a) What is the maximum height above the ground that the projectile reached?

b) How long did it take to reach the maximum height?

c) Find the height of the building.

d) How long was the projectile in the air before it hit the ground?
(Nearest 10th of a second)(Hint: substitute h=0)

Click here to see answer by ikleyn(52756)

Question 1162477: Before a football game, a coin toss is used to determine which team will kick off. The height h (in feet) of a coin above the ground t seconds after being flipped up into the air is given by
h = −16t2 + 22t + 3.
Click here to see answer by ikleyn(52756)

Question 1162524: Each side of a square is increased 4 inches. When this happens, the area is multiplied by 16. How many inches in the side of the original square?
Click here to see answer by ikleyn(52756)

Question 1162564: The length of a rectangle is 10 feet longer than it is wide. If each side is increased 10 feet, then the area is multiplied by 4. What was the size of the original rectangle?
Click here to see answer by josgarithmetic(39614)

Question 1162589: Two companies working together can clear a parcel of land in 9 hours. Working alone, it would take Company A 8 hours longer to clear the land than it would Company B. How long would it take Company B to clear the parcel of land alone? (Round your answer to the nearest tenth.)

Click here to see answer by josgarithmetic(39614)

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, 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