New!
Get regular updates about newly solved problems
via algebra.com's RSS system.
Recent problems solved by 'checkley77'
checkley77 answered: 12560 problems
Jump to solutions: 0..29 , 30..59 , 60..89 , 90..119 , 120..149 , 150..179 , 180..209 , 210..239 , 240..269 , 270..299 , 300..329 , 330..359 , 360..389 , 390..419 , 420..449 , 450..479 , 480..509 , 510..539 , 540..569 , 570..599 , 600..629 , 630..659 , 660..689 , 690..719 , 720..749 , 750..779 , 780..809 , 810..839 , 840..869 , 870..899 , 900..929 , 930..959 , 960..989 , 990..1019 , 1020..1049 , 1050..1079 , 1080..1109 , 1110..1139 , 1140..1169 , 1170..1199 , 1200..1229 , 1230..1259 , 1260..1289 , 1290..1319 , 1320..1349 , 1350..1379 , 1380..1409 , 1410..1439 , 1440..1469 , 1470..1499 , 1500..1529 , 1530..1559 , 1560..1589 , 1590..1619 , 1620..1649 , 1650..1679 , 1680..1709 , 1710..1739 , 1740..1769 , 1770..1799 , 1800..1829 , 1830..1859 , 1860..1889 , 1890..1919 , 1920..1949 , 1950..1979 , 1980..2009 , 2010..2039 , 2040..2069 , 2070..2099 , 2100..2129 , 2130..2159 , 2160..2189 , 2190..2219 , 2220..2249 , 2250..2279 , 2280..2309 , 2310..2339 , 2340..2369 , 2370..2399 , 2400..2429 , 2430..2459 , 2460..2489 , 2490..2519 , 2520..2549 , 2550..2579 , 2580..2609 , 2610..2639 , 2640..2669 , 2670..2699 , 2700..2729 , 2730..2759 , 2760..2789 , 2790..2819 , 2820..2849 , 2850..2879 , 2880..2909 , 2910..2939 , 2940..2969 , 2970..2999 , 3000..3029 , 3030..3059 , 3060..3089 , 3090..3119 , 3120..3149 , 3150..3179 , 3180..3209 , 3210..3239 , 3240..3269 , 3270..3299 , 3300..3329 , 3330..3359 , 3360..3389 , 3390..3419 , 3420..3449 , 3450..3479 , 3480..3509 , 3510..3539 , 3540..3569 , 3570..3599 , 3600..3629 , 3630..3659 , 3660..3689 , 3690..3719 , 3720..3749 , 3750..3779 , 3780..3809 , 3810..3839 , 3840..3869 , 3870..3899 , 3900..3929 , 3930..3959 , 3960..3989 , 3990..4019 , 4020..4049 , 4050..4079 , 4080..4109 , 4110..4139 , 4140..4169 , 4170..4199 , 4200..4229 , 4230..4259 , 4260..4289 , 4290..4319 , 4320..4349 , 4350..4379 , 4380..4409 , 4410..4439 , 4440..4469 , 4470..4499 , 4500..4529 , 4530..4559 , 4560..4589 , 4590..4619 , 4620..4649 , 4650..4679 , 4680..4709 , 4710..4739 , 4740..4769 , 4770..4799 , 4800..4829 , 4830..4859 , 4860..4889 , 4890..4919 , 4920..4949 , 4950..4979 , 4980..5009 , 5010..5039 , 5040..5069 , 5070..5099 , 5100..5129 , 5130..5159 , 5160..5189 , 5190..5219 , 5220..5249 , 5250..5279 , 5280..5309 , 5310..5339 , 5340..5369 , 5370..5399 , 5400..5429 , 5430..5459 , 5460..5489 , 5490..5519 , 5520..5549 , 5550..5579 , 5580..5609 , 5610..5639 , 5640..5669 , 5670..5699 , 5700..5729 , 5730..5759 , 5760..5789 , 5790..5819 , 5820..5849 , 5850..5879 , 5880..5909 , 5910..5939 , 5940..5969 , 5970..5999 , 6000..6029 , 6030..6059 , 6060..6089 , 6090..6119 , 6120..6149 , 6150..6179 , 6180..6209 , 6210..6239 , 6240..6269 , 6270..6299 , 6300..6329 , 6330..6359 , 6360..6389 , 6390..6419 , 6420..6449 , 6450..6479 , 6480..6509 , 6510..6539 , 6540..6569 , 6570..6599 , 6600..6629 , 6630..6659 , 6660..6689 , 6690..6719 , 6720..6749 , 6750..6779 , 6780..6809 , 6810..6839 , 6840..6869 , 6870..6899 , 6900..6929 , 6930..6959 , 6960..6989 , 6990..7019 , 7020..7049 , 7050..7079 , 7080..7109 , 7110..7139 , 7140..7169 , 7170..7199 , 7200..7229 , 7230..7259 , 7260..7289 , 7290..7319 , 7320..7349 , 7350..7379 , 7380..7409 , 7410..7439 , 7440..7469 , 7470..7499 , 7500..7529 , 7530..7559 , 7560..7589 , 7590..7619 , 7620..7649 , 7650..7679 , 7680..7709 , 7710..7739 , 7740..7769 , 7770..7799 , 7800..7829 , 7830..7859 , 7860..7889 , 7890..7919 , 7920..7949 , 7950..7979 , 7980..8009 , 8010..8039 , 8040..8069 , 8070..8099 , 8100..8129 , 8130..8159 , 8160..8189 , 8190..8219 , 8220..8249 , 8250..8279 , 8280..8309 , 8310..8339 , 8340..8369 , 8370..8399 , 8400..8429 , 8430..8459 , 8460..8489 , 8490..8519 , 8520..8549 , 8550..8579 , 8580..8609 , 8610..8639 , 8640..8669 , 8670..8699 , 8700..8729 , 8730..8759 , 8760..8789 , 8790..8819 , 8820..8849 , 8850..8879 , 8880..8909 , 8910..8939 , 8940..8969 , 8970..8999 , 9000..9029 , 9030..9059 , 9060..9089 , 9090..9119 , 9120..9149 , 9150..9179 , 9180..9209 , 9210..9239 , 9240..9269 , 9270..9299 , 9300..9329 , 9330..9359 , 9360..9389 , 9390..9419 , 9420..9449 , 9450..9479 , 9480..9509 , 9510..9539 , 9540..9569 , 9570..9599 , 9600..9629 , 9630..9659 , 9660..9689 , 9690..9719 , 9720..9749 , 9750..9779 , 9780..9809 , 9810..9839 , 9840..9869 , 9870..9899 , 9900..9929 , 9930..9959 , 9960..9989 , 9990..10019 , 10020..10049 , 10050..10079 , 10080..10109 , 10110..10139 , 10140..10169 , 10170..10199 , 10200..10229 , 10230..10259 , 10260..10289 , 10290..10319 , 10320..10349 , 10350..10379 , 10380..10409 , 10410..10439 , 10440..10469 , 10470..10499 , 10500..10529 , 10530..10559 , 10560..10589 , 10590..10619 , 10620..10649 , 10650..10679 , 10680..10709 , 10710..10739 , 10740..10769 , 10770..10799 , 10800..10829 , 10830..10859 , 10860..10889 , 10890..10919 , 10920..10949 , 10950..10979 , 10980..11009 , 11010..11039 , 11040..11069 , 11070..11099 , 11100..11129 , 11130..11159 , 11160..11189 , 11190..11219 , 11220..11249 , 11250..11279 , 11280..11309 , 11310..11339 , 11340..11369 , 11370..11399 , 11400..11429 , 11430..11459 , 11460..11489 , 11490..11519 , 11520..11549 , 11550..11579 , 11580..11609 , 11610..11639 , 11640..11669 , 11670..11699 , 11700..11729 , 11730..11759 , 11760..11789 , 11790..11819 , 11820..11849 , 11850..11879 , 11880..11909 , 11910..11939 , 11940..11969 , 11970..11999 , 12000..12029 , 12030..12059 , 12060..12089 , 12090..12119 , 12120..12149 , 12150..12179 , 12180..12209 , 12210..12239 , 12240..12269 , 12270..12299 , 12300..12329 , 12330..12359 , 12360..12389 , 12390..12419 , 12420..12449 , 12450..12479 , 12480..12509 , 12510..12539 , 12540..12569, >>NextFunctions/169403: Write a function rule: the volume V(n) of a cube when you know the length of a side.
Please show work.
Thank you very much for your help!! 1 solutions
Answer 124888 by checkley77(12569) on 2008-11-24 16:47:47 (Show Source):
|
Age_Word_Problems/169336: In how many years will Mr. Sison be 7 times that of his son if he is now 69 years old and his son is 3?
Please give me he representation of your answer thank you!!!! 1 solutions
Answer 124831 by checkley77(12569) on 2008-11-24 09:18:11 (Show Source):
You can put this solution on YOUR website!69+x=7(3+x)
69+x=21+7x
x-7x=21-69
-6x=-48
x=-48/-6
x=8 years from now dad will be 7 times as old as his son.
Proof:
69+8=8(3+8)
77=7*11
77=77
|
Age_Word_Problems/169337: There were 770 tickets sold for a ballet performance at the CCP. The tickets cost P2,500 for semi-VIP seats and P5000 for VIP seats. A total of P2,800,000 was collected. How many of each kind of ticket were sold?
Please give me the representation of your problem thank you very much.... 1 solutions
Answer 124830 by checkley77(12569) on 2008-11-24 09:14:13 (Show Source):
You can put this solution on YOUR website!2,500x+5,000(770-x)=2,800,000
2,500x+3,850,000-5,000x=2,800,000
-2,500x=2,800,000-3,850,000
-2,500x=-1,050,000
x=-1,050,000/-2,500
x=420 semi-VIP tickets sold.
770-420=350 VIP tickets sold.
Proof:
2,500*420+5,000*350=2,800,000
1,050,000+1,750,000=2,800,000
2,800,000=2,800,000
|
Linear-equations/169290: This question is from textbook beginning algebra
please help me with this problem. i am having trouble because i am getting stuck on it. please help me. thank you.
simplify both sides of the following equations as much as possible, and then solve.
-11x+2+10x+2x=9
thank you!! 1 solutions
Answer 124818 by checkley77(12569) on 2008-11-23 22:09:43 (Show Source):
|
Money_Word_Problems/169285: Any help with this problem would be great...
What rate of interest, to the nearest tenth of a percent, compounded annually is needed for an investment of $1,500 to grow to $3,300 in four years?
Thanks to all the tutors out there. 1 solutions
Answer 124816 by checkley77(12569) on 2008-11-23 22:06:32 (Show Source):
You can put this solution on YOUR website!1500(1+r)^4=3300
(1+r)^4=3300/1500
(1+r)^4=2.2
1+r=4thrt(2.2)
1+r=1.21788
r=1.21788-1
r=.21788 ans. for the rate.
Proof:
1500(1+.21788)^4=3300
1500(1.21788)^4=3300
1500*2.2=3300
3300=3300
|
Probability-and-statistics/169284: We selected 3 seeds out of a bag. The bag contains 6 seeds for yellow flowers, 4 red and seven white.
What's the probability that the 3 seeds grow white flowers?
What's the probability that the 3 seeds grow same colored flowers? 1 solutions
Answer 124814 by checkley77(12569) on 2008-11-23 21:57:24 (Show Source):
You can put this solution on YOUR website!White seeds:
7/17*6/16*5/15=210/4080=7/136 chances (or 5.147%) of the 3 being white seeds.
6/17*5/16*4/15=120/4080=4/136 chances (or 2.941%) of the 3 being yellow.
4/17*3/16*2/15=24/4080=8/1360 chances (or 0.588%) of the 3 being red.
7/136+4/136+8/1360
(70+40+8)/1360
118/1360=.086765 or 8.6765% success in all 3 being the same color.
|
Quadratic_Equations/169268: a rectangular page in a book is to have an 18 cm by 23 cm illustration in the center with equal margins on all four sides. How wide should the margins be if the page has an area of 594 square cm? 1 solutions
Answer 124811 by checkley77(12569) on 2008-11-23 21:42:37 (Show Source):
You can put this solution on YOUR website!18*23=414 cm^2 is the center illustration.
(13+2x)(23+2x)=594
299+46x+26x+4x^2=594
4x^2+72x+299-594=0
4x^2+72-295=0
Using the quadratic equation  we get:
x=(-72+-sqrt[72^2-4*4*-295])/2*4
x=(-72+-sqrt[5184+4720])/8
x=)-71+-sqrt9904)/8
x=(-72+-99.5188)/8
x=27.5188/8
x=3.43986 cm. ans for the margin.
Proof:
(13+2*3.43986)(23+2*4.43986)=594
(13+6.8797)(23+6.8797)=594
19.8797*29.8797=594
594~594
|
Sequences-and-series/169219: How do I find the next two terms of geometric sequence 6250, 5000, 4000,...
and also how do I find four geometric means between 4096 and 972. I must show my work and don't know how to do these.
Please help.
Thanks 1 solutions
Answer 124803 by checkley77(12569) on 2008-11-23 20:55:07 (Show Source):
You can put this solution on YOUR website!6,250, 5,000, 4,000, 3,200, 2,560
[each term is multiplied by .8 or divided by 1.25]
----------------------------------------------------------
972/4096=.23730479
x^5=.23730479
x=5th root of .23730479
x=.75 is the multiplier for these 4 middle terms.
Proof
4096*.75=3072*.75=2304*.75=1728*.75=1296*.75=972.
|
Probability-and-statistics/169225: I have two questions. Will you please help
1. A scout troop will prepare trail mix for their next hike. They have decided to mix one type of nut, one type of dried fruit, and one type of granola. The local store carries 8 types of nuts, 6 types of dried fruit, and 5 types of granola. How many different trail mixes are possible.
2. Students are given a list of ten vocabulary words to learn. In how many ways could four of the words be listed on a test?
I must show my work. Will you please help.
Thank you 1 solutions
Answer 124801 by checkley77(12569) on 2008-11-23 20:24:27 (Show Source):
You can put this solution on YOUR website!8*6*5=240 different mixes are possible.
-------------------------------------------
10*9*8*7=5,040 ways 4 words out of 10 can be listed on a 4 question test.
|
Expressions-with-variables/169229: I know this is a very simple type of equation, but I've forgotten which ones can cancel out and which have to stay.
This is the problem:
(6a)(-4b)
_________
(-2ab)(-3b)
It's multiple choice, so the possible answers are:
A. 4b
B. 4/b
C. -4a
D. -4/a
E. -4/b
Please help! 1 solutions
Answer 124800 by checkley77(12569) on 2008-11-23 20:20:04 (Show Source):
You can put this solution on YOUR website!(6a)(-4b)
_________ multiply these terms.
(-2ab)(-3b)
-24ab/6ab^2 now divide -24 by 6=-4, cancel out the (a) terms one of the (b) terms.
-4/b ans. E)
|
Systems-of-equations/169262: soybean meal is 14% protein, cornmeal is 7% protein. How many pounds of each should be mixed together in order to get 280lb mixture that is 9% protein? 1 solutions
Answer 124793 by checkley77(12569) on 2008-11-23 20:05:33 (Show Source):
You can put this solution on YOUR website!.14x+.07(280-x)=.09*280
.14x+19.6-.07x=25.2
.07x=25.2-19.6
.07x=5.6
x=5.6/.07
x=80 lbs. of soybeans is used
280-80=200 lbs. of corn meal is used.
Proof:
.14*80+.07*200=25.2
11.2+14=25.2
25.2=25.2
|
Miscellaneous_Word_Problems/169206: (x+5) acres facing the Seventy-five acres of land were purchased for $142 500. The land facing the highway cost $2700 per acre. The land facing the railroad cost $2200 per acre and the remainder cost $1450 per acre. There were 5 acres more facing the railroad than the highway. How much land was at each price? 1 solutions
Answer 124772 by checkley77(12569) on 2008-11-23 16:21:21 (Show Source):
You can put this solution on YOUR website!(x+5) acres facing the railroad @ 2,200
x acres facing the highway @ 2,700
75-(x+5)-x acres in the middle @1,450
142,500=2,200(x+5)+2,700x+1,450[75-(x+5)-x]
142,500=2,200x+11,000+2,700x+1,450[70-2x]
142,500=11,000+4,900x+101,500-2,900x
142,500-11,000-101,500=2,000x
30,000=2,000x
30,000/2,000=x
x=15 acres facing the highway.
15+5=20 acres facing the railroad.
75-15-20=40 acres in the middle.
Proof:
142,500=2,200*20+2,700*15+1,450*40
142,500=44,000+40,500+58,000
142,500=142,500
|
Equations/169202: A tank contains 440 litres of a mixture which is 23.0% acid. How many litres of a mixture which is 12.0% acid must be added to get a mixture which is 14.5% acid. 1 solutions
Answer 124768 by checkley77(12569) on 2008-11-23 16:02:08 (Show Source):
You can put this solution on YOUR website!.23*440+.12x=.145(440+x)
101.2+.12x=63.8+.145x
.12x-.145x=63.8-101.2
-.025x=-37.4
x=-37.4/-.025
x=1,496 liters of 12% acid are used.
Proof:
.23*440+.12*1,496=.145(440+1,496)
101.2+179.52=.145*1,936
280.72=280.72
|
Quadratic_Equations/169120: Find the corresponding y values for x=-4, -3, -2 if y+x^+2x-15. 1 solutions
Answer 124761 by checkley77(12569) on 2008-11-23 15:27:22 (Show Source):
You can put this solution on YOUR website!y+x^[2]+2x-15 I'll assume you meant to have a [^2) power for the first x term?
When x=-4:
x(-4)=y+(-4^2)+2*-4-15
x(-4)=y+16-8-15
x(-4)=y-7 ans.
Where x=-3
x(-3)=y+(-3)^2+2*-3-15
x(-3)=y+9-6-15
x(-3)=y-12 ans.
Where x=-2
x(-2)=y(-2)^2+2*-2-15
x(-2)=y+4-4-15
x(-2)=y-15 ans.
|
Systems-of-equations/169161: soybean meal is 14% protein, cornmeal is 7% protein, how many pounds of each should be mixed together in order to get a 280 pound mixture that is 12% protein 1 solutions
Answer 124754 by checkley77(12569) on 2008-11-23 15:03:00 (Show Source):
You can put this solution on YOUR website!.14x+.07(280-x)=.12*280
.14x+19.6-.07x=33.6
.07x=33.6-19.6
.07x=14
x=14/.07
x=200 pds. of soybeans is used.
280-200=80 pds. of cornmeal is uded.
Proof:
.14*200+.07*80=33.6
28+5.6=33.6
33.6=33.6
|
|