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, >>Next
Permutations/360364: A company sells a product called Make-Your-Doll. it is a toy that consists of three doll bodies, five doll heads, four sets of legs, and two sets of arms. A child assembles the doll he or she wishes to play with. How many complete dolls should be marketing manager advertises that the kit can make if a doll consists of one representative from each of the following groups: body, head, legs, and arms?
1 solutions
Answer 257153 by checkley77(12569)   on 2010-10-23 09:52:32 (Show Source):
|
Polynomials-and-rational-expressions/360365: I am having trouble with my MAT 117 Appendix C. This is what I have so far. Could you help me out please?
4. A customer wants to make a teepee in his backyard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the teepee, and he wants the teepee to be 18 feet across and 6 feet tall (see figure). How long should the pieces of PVC plumbing pipe be? Round your answer to the nearest hundredth.
This is waht I have so far.
a^2+b^2=c^2
(18/2)^2+6^2=c^2
9^2+6^2=c^2
81+36=c^2
117=c^2
1 solutions
Answer 257152 by checkley77(12569) on 2010-10-23 09:49:13 (Show Source):
|
Miscellaneous_Word_Problems/360167: A rectangular garden is to be surrounded by a walkway of constant width. The garden’s dimensions are 20 ft by 28 ft. The total area, garden plus walkway, is to be 1,100 ft2. What must be the width of the walkway?
1 solutions
Answer 257041 by checkley77(12569) on 2010-10-22 17:48:26 (Show Source):
You can put this solution on YOUR website!(20+2X)(28+2X)=1,100
560+56X+40X+4X^2=1,100
4X^2+96X+560-1,100=0
4X^2+96X-540=0
4(X^2+24X-135)=0
X=(-24+-SQRT[2462-4*1*-135])/2*1
X=(-24+-SQRT[576+540])/2
X=(-24+-SQRT1,116)/2
X=(-24+-33.4)/2
X=(-24+33.4)/2
X=9.4/2
X=4.7 FT. IS THE WIDTH OF THE WALKWAY.
|
Travel_Word_Problems/360184: Traveling for 3hr into a steady head wind, a plane flies 1650 mi. The pilot determines that flying with the same wind for 2hr, he could make a trip of 1300mi. Find the speed of the plane and the speed of the wind.
1 solutions
Answer 257037 by checkley77(12569) on 2010-10-22 17:37:08 (Show Source):
You can put this solution on YOUR website!D=RT
1,650=R*3
R=1.650/3
R=550 MPH INTO THE WIND.
1,300=R*2
R=1,300/2
R=650 MPH WITH THE WIND.
(650-550)/2=100/2=50 MPH. IS THE RSTE OF THE WIND.
550+50=600 MPH. IS THE SPEED OF THE PLABVE IN STILL AIR.
650-50=600 DITTO.
|
test/360188: Solve the system of equation.
-x + 2y = 1
0.875x + 2y = 2.875
1 solutions
Answer 257036 by checkley77(12569) on 2010-10-22 17:31:09 (Show Source):
You can put this solution on YOUR website!-x + 2y = 1
0.875x + 2y = 2.875 SUBTRACT
-------------------------------
-1.875X=-1.875
X=-1.875/-1.875
X=1 ANS.
-1+2Y=1
2Y=1+1
2Y=2
Y=2/2
Y=1 ANS.
PROOF:
.875*1+2*1=2.875
.875+2=2.875
3.875=2.875
|
Miscellaneous_Word_Problems/360201: (1 pt) You are offered two different sales jobs. The first company offers a straight commission of 5% of the sales. The second company offers a salary of $ 490 per week plus 3% of the sales. How much would you have to sell in a week in order for the straight commission offer to be at least as good?
1 solutions
Answer 257032 by checkley77(12569) on 2010-10-22 17:21:24 (Show Source):
You can put this solution on YOUR website!.05X=490+.03X
.05X-.03X=490
.02X=490
X=490/.02
X=24,500 AMOUNT OF COMMISSION SALES ARE REQUIRED.
.05*24,500=490+.03*24,500
1,225=490+735
1,225=1,225
|
Miscellaneous_Word_Problems/360204: Two solutions of salt water contain 0.09% and 0.25% salt respectively. A lab technician wants to make 1 liter of solution which contains 0.19% salt. How much of each solution should she use?
1 solutions
Answer 257030 by checkley77(12569) on 2010-10-22 17:17:19 (Show Source):
You can put this solution on YOUR website!.25X+.09(1-X)=.19*1
.25X+.09-.09X=.19
.16X=.19-.09
.16X=.10
X=.10/.16
X=.625 L. OF 25% SOLUTION IS USED.
1=.625-.375 L. OF 9% SOLUTION IS USED.
PROOF:
.25*.625+.09*.375=.19*1
.15625+.03375=.19
.19=.19
|
Rectangles/360206: the length of a rectangular jewelry box is 5 inches more than twice the width. the perimeter is 22 inches. what's the length and width?
1 solutions
Answer 257029 by checkley77(12569) on 2010-10-22 17:09:53 (Show Source):
|
Quadratic_Equations/360222: Hi There, I was hoping someone could guide me through this problem. If it's not too much trouble, I am looking for the steps to solve to be included in the answer.
Directions: Solve
A ladder that is 10ft long is 6ft from the base of the wall. How far up the wall does the ladder reach?
1 solutions
Answer 257026 by checkley77(12569) on 2010-10-22 16:59:59 (Show Source):
You can put this solution on YOUR website!You have a right triangle with a base=6ft.
The hypotenuse=10 ft.
Using the formula:
a^2+b^2=c^2
6^2+b^2=10^2
36+b^2=100
b^2=100-36
b^2=64
b=sqrt64
b=8 ft is the height up the wall that the ladder reaches.
|
Quadratic_Equations/360224: Hello! Jess here! I was wondering if someone could help me. This week my class is working on problems and I don't quite understand how to obtain the answer of some of them. If someone could be so kind as to lead me through (with all the steps) the following problem, I would be most appreciative.
The directions are: Solve the equation by the square root property.
6x^2=96
1 solutions
Answer 257025 by checkley77(12569) on 2010-10-22 16:55:06 (Show Source):
You can put this solution on YOUR website!6x^2=96
6x^2-96=0 extract the common factor 6.
6(x^2-16)=0 factor the quadratic equation.
6(x+4)(x-4)=0 solve the two factors.
x+4=0
x=-4 ans.
x-4=0
x=4 ans.
Proofs:
6(-4)^2=96
6*16=96
6*4^2=96
6*16=96
96=96
|
test/359769: -5y+6=-34
I need you're help with this for me PLZ can u help me !I have my question in the top PLZ HELp me !
1 solutions
Answer 256754 by checkley77(12569) on 2010-10-21 17:41:49 (Show Source):
|
Rectangles/359774: The perimeter of a rectangle is 40.
If the width is 3x-8 and the length 2x + 3 what is x?
1 solutions
Answer 256753 by checkley77(12569) on 2010-10-21 17:39:46 (Show Source):
You can put this solution on YOUR website!W=3x-8
L=2x + 3
2L+2W=40
2(2X+3)+2(3X-8)=40
4X+6+6X-16=40
10X=40-6+16
10X=50
X=50/10
X=5 SOLUTION.
W=3*5-8=15-8=7 ANS.
L=2*5+3=10+3=13 ANS.
PROOF:
2*13+2*7=40
26+14=40
40=40
|
Evaluation_Word_Problems/359715: Mike discovered that the pool in his backyard is leaking slowly. The pool holds 16,968 gallons of water, and is leaking at a rate of 12 gallons per day. If Mike does not replace the water that has leaked from the pool, how many gallons of water will remain in the pool after 199 days?
1 solutions
Answer 256746 by checkley77(12569) on 2010-10-21 16:49:43 (Show Source):
|
Geometry_Word_Problems/359734: The length of a rectangle is 8 inches more than its width. The perimeter of the rectangle is 24 inches. What are the width and length of the rectangle?
1 solutions
Answer 256744 by checkley77(12569) on 2010-10-21 16:46:03 (Show Source):
You can put this solution on YOUR website!L=2W+8
2L+2W=24
2(2W+8)+2W=24
4W+16+2W=24
6W=24-16
6W=8
W=8/6
W=4/3 ANS.
L=2*4/3+8
L=8/3+8
L=8/3+24/3
L=32/3 ANS.
PROOF:
2*4/3+2*32/3=24
8/3+64/3=24
72/3=24
24=24
2+20
|
Linear-equations/359743: my first qustion is how do you graph the linear equation 3x+y=7
my second question is how do you write an equation for "parallel to x+2=0 with x-intercept (-1,0)" in a slope intercept form?
1 solutions
Answer 256741 by checkley77(12569) on 2010-10-21 16:34:48 (Show Source):
You can put this solution on YOUR website!3x+y=7
y=-3x+7
 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, -3x +7).
------------------------------------------------------------------------------
"parallel to x+2=0 with x-intercept (-1,0)"
x=-2
x=-1
|
Rectangles/359333: The perimeter of a Desktop is 108 inches, the width is 14 inches shorter than the length,write an eqaution to represent the perimeter and determine the dimension of the desktop?
1 solutions
Answer 256441 by checkley77(12569) on 2010-10-20 19:38:43 (Show Source):
You can put this solution on YOUR website!W=L-14
2L+2W=108
2L+2(L-14)=108
2L+2L-28=108
4L=108+28
4L=136
L=136/4
L=34 ANS. FOR THE LENGTH.
W=34-14=20 ANS. FOR THE WIDTH.
PROOF:
2*34+2*20=108
68+40=108
108=108
|
Permutations/359337: Every student in a discrete math class is either a computer science or a mathematics major or is a joint major in these two subjects. How many students are in the class if there are 30 computer science majors(including joint majors), 24 math majors(including joint majors) and 9 joint majors?
1 solutions
Answer 256437 by checkley77(12569) on 2010-10-20 19:32:36 (Show Source):
|
|
