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Question 1138215: 7 years ago Samuel was three times David's age. in 4 years Samuel will be twice David's age. What is David's age?
Click here to see answer by josgarithmetic(39616)

Question 1138228: Someone please help me!!!
Three generations. Edwin, his father, and his grandfather have an average age of 53. One-half of his grandfather s age, plus one-third of his father s age, plus one-fourth of Edwin s age is 65. If 4 years ago, Edwin s grandfather was four times as old as Edwin, then how old are they all now?
I know how to do the math but I have no idea what the three equations would be... please help
Click here to see answer by josgarithmetic(39616)

Question 1138229: Someone please help..
Big tipper. On Monday Headley paid $1.70 for two cups of coffee and one doughnut, including the tip. On Tuesday he paid $1.65 for two doughnuts and a cup of coffee, including the tip. On Wednesday he paid $1.30 for one coffee and one doughnut, including the tip. If he always tips the same amount, then what is the amount of each item?
I know how to do the math but I have no idea what the three equations would be... please help
Click here to see answer by ikleyn(52776)

Question 1138226: Someone please help me!!! The question is:
Error in the scale. Alex is using a scale that is known to have a constant error. A can of soup and a can of tuna are placed on this scale, and it reads 24 ounces. Now four identical cans of soup and three identical cans of tuna are placed on an accurate scale, and a weight of 80 ounces is recorded. If two cans of tuna weigh 18 ounces on the bad scale, then what is the amount of error in the scale and what is the correct weight of each type of can?
I know how to do the math I just have no idea what the three equations would be.
Click here to see answer by Theo(13342)

Question 1138279: Lydia collects shells. She has 24 sea snail shells, 16 conch shells, and 32 scallop shells. She wants to display the shells in equal rows, with only one type of shell in each row. What is the greatest number of shells Lydia can put in each row?
Click here to see answer by ikleyn(52776)

Question 1138552: What is 1/10 of 500 km

Click here to see answer by rothauserc(4718)

Question 1138632: John wants to buy a new sports car, and he estimates that he'll need to make a $3,025.00 down payment towards his purchase. If he has 17 months to save up for the new car, how much should he deposit into his account if the account earns 3.979% compounded continuously so that he may reach his goal? John needs to deposit how much money?
Click here to see answer by Theo(13342)

Question 1138630: P=f(t) gives the size of a population that begins with 30,000 members and grows at a continuous annual rate of 1.56%.
Find a formula for the population,

Click here to see answer by Boreal(15235)

Question 1138636: The amount in grams of a drug in the body t hours after taking a pill is given by A(t)=18(0.85)^t
(a) What is the initial dose given?
b) What percent of the drug leaves the body after each hour?
(c) What is the amount of drug left after 7 hours?
Click here to see answer by josmiceli(19441)

Question 1138651: On a dry asphalt road, a car’s stopping distance varies directly as the square of its speed.
A car traveling at 45 miles per hour can stop in 67.5 feet. What is the stopping distance
for a car traveling at 60 miles per hour?
Click here to see answer by josmiceli(19441)

Question 1138635: How much do you need to invest in an account earning an annual interest rate of 3.259% compounded daily, so that your money will grow to $7,210.00 in 50 days?

Click here to see answer by josmiceli(19441)

Question 1138710: Find the line equation for the x intercept of 4 and a y intercept of -7. I have the correct answer but my professor wants a more detailed explanation with slope formula and step by step details. I have submitted twice already and she wants more. Help!
Click here to see answer by josgarithmetic(39616)

Question 1138714: I need an equation for adding multiple mix fractions.Example:
1/16 + 3/9 + 4 + 7/12 + 8/17 =
Click here to see answer by josgarithmetic(39616)

Question 1138714: I need an equation for adding multiple mix fractions.Example:
1/16 + 3/9 + 4 + 7/12 + 8/17 =
Click here to see answer by ikleyn(52776)

Question 1138716: The Ram Company borrowed $20 000 at 10% compounded semi-annually and made payments toward the loan of $8000 after two years and $10 000 after three-and-a-half years. How much is required to pay off the loan one year after the second payment?

Click here to see answer by Theo(13342)

Question 1138794: algebraic word problems:
The width of a rectangle is 3/4 of the length. The perimeter of the rectangle becomes 50 cm when the length and width are each increased by 2 cm. Find the length and the width.

Click here to see answer by josmiceli(19441)

Question 1138896: algebraic word pain in the ass problems:
Cookies are set out on a tray for 6 people to take home. one-third, one-fourth, one-eighth, and one-fifth are given to 4 people. The fifth person eats 10 cookies on the spot, with 1 remaining for the 6th person. Find the original number of cookies on the tray.

Click here to see answer by greenestamps(13198)

Question 1138955: If a basketball has a radius of 6 inches, approximately how many cubic inches of air will it hold when fully inflated?
Chris is planning to fill up a kiddie swimming pool for his younger sister but he does not have a water hose. He has decided to use a cylindrical bucket with a diameter of 12 inches and a height of 14.5 inches. He has already calculated the approximate volume of the kiddie pool to be able to hold about 60,000 cubic inches of water. Approximately how many buckets of water will he need to use in order to fill the kiddie pool?

Click here to see answer by josgarithmetic(39616)

Question 1138974: (8, -3) m= 1/6
Find the equation of the line given slope and point
put into this form y = mx + b
Thanks
Click here to see answer by ikleyn(52776)

Question 1139063: Solve the co-ordinate of the mid-point of intersection of the line 2y +3x=16, 7y=2x+6, hence find the equation of the line through the points with gradient -3/4
Click here to see answer by Theo(13342)

Question 1139062: Find the equation of straight line that passes through point L and M were L is the mid-point of the straight line joining A(-1, 6) to B(5,4) and M is the mid-point of the line joining C(-5, -1) to D(3, -1)
Click here to see answer by josmiceli(19441)

Question 1139074: Sophia was just hired at a local business. She is given a starting salary of $52,500 per year. She is also told that her salary will increase to $55,675 in 5 years. Assume that x = the years worked and y = Salary in dollars
1) What is the rate of change of Sophia’s salary?
2) Create the slope-intercept equation of the line that represents Sophia’s salary.
3) Using your equation in (2), find the value of Sophia’s salary in 17 years.
Click here to see answer by josgarithmetic(39616)

Question 1139064: Find the equation of the locus
(a) PA=PB
(b) PA^2-PB^2=4
(c) 2PA=1/2PB
(d) PA=3PB
Click here to see answer by greenestamps(13198)

Question 1139113: please help me answer the following equation:
1.) rearrange the following equation to find μ:
0.6=e^μ*2.1
Click here to see answer by Theo(13342)

Question 1139106: Find the number of real-number solutions of the equation: 0=8x^2
Click here to see answer by Theo(13342)

Question 1139160:
Click here to see answer by josgarithmetic(39616)

Question 1139196: Truck A is priced at $450 and gets 25 miles per gallon. Truck B is priced at $650 and gets 35 miles per gallon. If gasoline cost $4 per gallon how many miles would I have to drive to make truck B the better buy
Click here to see answer by josgarithmetic(39616)

Question 1139195: Truck A is priced at $450 and gets 25 miles per gallon. Truck B is priced at $650 and gets 35 miles per gallon. If gasoline cost $4 per gallon how many miles would I have to drive to make truck B the better buy
Click here to see answer by ikleyn(52776)

Question 1139237: please help me answer the following question:
1.) rearrange the following equation to find L:

Click here to see answer by MathLover1(20849)

Question 1139274: A 1-pound box of crackers is priced at $2.69. Convert this price per pound (lb) to dollars per ounce (oz) so that it can be compared to the price of different-sized boxes. (Round answer to two decimal places. 1 lb. = 16 oz.)
I think I would have to divide in this situation? I might be wrong. I’m generally really bad at word problems.
Click here to see answer by josgarithmetic(39616)

Question 1139272: Mariana averaged 76 on her first three exams. The first score was 77. The second score was 3 less than the third score. What did she score on the second and third exams?
Click here to see answer by josgarithmetic(39616)

Question 1139314: Solve 5x÷6=20.
Click here to see answer by ikleyn(52776)

Question 1139314: Solve 5x÷6=20.
Click here to see answer by SilverFox1948(1)

Question 1139314: Solve 5x÷6=20.
Click here to see answer by josgarithmetic(39616)

Question 1139333: for 7x+9y=-12
to find points on a graph i know you have to put the line in slope intercept form and i get y=-7/9-12/9 nut how do you get points with fractions if that makes any sense
please and thank you
Click here to see answer by josgarithmetic(39616)

Question 1139332: Given that x-y= 8•sqrt(2) and xy= 137, where x and y are both positive, find the value of x+y without finding x or y
Click here to see answer by ikleyn(52776)

Question 1139332: Given that x-y= 8•sqrt(2) and xy= 137, where x and y are both positive, find the value of x+y without finding x or y
Click here to see answer by greenestamps(13198)

Question 1139339: Given: y varies jointly as m and p and inversely as the cube root of w
If y=12, when m=3, p=2, and w=512, find y when m=5, p=2,and w = 125
Possible answers
12.5
32
312.5
800
Click here to see answer by josgarithmetic(39616)

Question 1139340: Factor
a) a^4 +a^2b^2 +b^4
b) a^4 +4b^4
Click here to see answer by ikleyn(52776)

Question 1138783: The one-to-one functions g and h are defined as follows.
g = {(-7,4), (4,-7), (8,5), (9,-4)}
h(x) = 3x-13
Find the following.
g^-1(-7) =
h^-1(x) =
(h*h^1)(8) =
Click here to see answer by adamsmith9037(4)

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, 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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, 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, 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