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# Recent problems solved by 'checkley77'

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 Linear-systems/267285: Solve using elimination method. Label each system as consistent or inconsistent. Thank you. w + 8s = - 42 -9w - s = -481 solutions Answer 196243 by checkley77(12569)   on 2010-02-08 21:04:49 (Show Source): You can put this solution on YOUR website!w + 8s = - 42 multiply by 9 & add. -9w - s = -48 9w+72s=-378 -------------------- 71s=-426 s=-426/71 s=-6 ans. w+8*-6=-42 w-48=-42 w=-42+48 w=6 ans. Proof: -9*6-(-6)=-48 -54+6=-48 -48=-48
 Linear-equations/267286: y=1/2x+3 slope intercept form1 solutions Answer 196241 by checkley77(12569)   on 2010-02-08 21:00:03 (Show Source): You can put this solution on YOUR website!Y=mX+b y=1/2x+3 y=x/2+3 Slope (m)=1/2 Y intercept (b)=3 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, x/2 +3).
 Travel_Word_Problems/267294: What distance would you travel if your speed is 35Mph for 20 seconds?1 solutions Answer 196239 by checkley77(12569)   on 2010-02-08 20:56:43 (Show Source): You can put this solution on YOUR website!D=RT D=35(20/60) D=35*1/3 D=35/3 D=11 2/3 miles ans.
 Systems-of-equations/267296: SOLVE BY ELIMINATION -2x+5y=20 3x-7y=-261 solutions Answer 196237 by checkley77(12569)   on 2010-02-08 20:52:20 (Show Source): You can put this solution on YOUR website!-2x+5y=20 multiply by 3 3x-7y=-26 multiply by 2 & add. -6x+15y=60 6x-14y=-52 ------------- y=8 ans. -2x+5*8=20 -2x+40=20 -2x=20-40 -2x=-20 x=-20/-2 x=10 ans. Proof: 3*10-7*8=-26 30-56=-26 -26=-26
 Systems-of-equations/267302: Find the equation of the line containing the point (2,-5) and perpendicular to the line y=5/2x-4.1 solutions Answer 196236 by checkley77(12569)   on 2010-02-08 20:44:47 (Show Source): You can put this solution on YOUR website!(2,-5) and perpendicular to the line y=5x/2-4 (red line) Slope=5/2. The perpendicular line will have a slope=-2/5. -5=2*-2/5+b -5=-4/5+b b=-5+4/5 b=-25/5-4/5 b=-29/5 ans. for the Y intercept. y=-2x/5-29/5 (green line) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions 5x/2 -4 and -2x/5 -29/5).
 Linear-equations/267326: Find an equation for the line with given properties parallel to the line 2x-y=7 containing the point 0,01 solutions Answer 196233 by checkley77(12569)   on 2010-02-08 20:35:00 (Show Source): You can put this solution on YOUR website!Parallel to 2x-y=7 through 0,0 2x-y=7 -y=-2x+7 y=-2x/-1+7/-1 y=2x-7 (red line) A parallel line will have a slope=2. y=2x+0 (green line) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions 2x +7 and y = 2x).
 Signed-numbers/267327: you have 12 mp3 songs on your computer. 1/4 of them don't work . how many mp3 do you have to buy to replace the ones that don't work?1 solutions Answer 196231 by checkley77(12569)   on 2010-02-08 20:27:40 (Show Source): You can put this solution on YOUR website!12*1/4=12/4=3 don't work.
 Inequalities/267347: hey i really need help -5a+9>241 solutions Answer 196228 by checkley77(12569)   on 2010-02-08 20:20:04 (Show Source): You can put this solution on YOUR website!-5a+9>24 -5a>24-9 -5a>15 a<15/-5 a<-3 ans. Proof: Let a=-3.1 -5*-3.1+9>24 15.5+9>24 24.5>24
 Mixture_Word_Problems/267345: please solve a solution containing 30% juice is mixed with a solution containing 10% juice to make 100 gallons of solution that makes 12% juice.How much of the 30% solution was used? 1 solutions Answer 196226 by checkley77(12569)   on 2010-02-08 20:17:28 (Show Source): You can put this solution on YOUR website!.30x+.10(100-x)=.12*100 .30x+10-.10x=12 .20x=12-10 .20x=2 x=2/.2 x=10 gallons of 30% solution is used. 100-10=90 gallons 0f 10% is used. Proof: .30*10+.10*90=.12*100 3+9=12 12=12
 Linear-equations/267344: Write 3x-y+9=0 in slope intercept form.1 solutions Answer 196222 by checkley77(12569)   on 2010-02-08 20:12:41 (Show Source): You can put this solution on YOUR website!Y=mX+b m=slope & b=the Y intercept 3x-y+9=0 subtract 3x & 9 from both sides. -y=-3x-9 divide both sides by -1. y=3x+9 [3 is the slope & 9 is the Y intercept.] (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, 3x +9).
 Distributive-associative-commutative-properties/267342: y=x2+12x+351 solutions Answer 196220 by checkley77(12569)   on 2010-02-08 20:10:52 (Show Source): You can put this solution on YOUR website!y=x2+12x+35 y=(x+7)(x+5) ans.
 Travel_Word_Problems/267221: A car traveled 100 kilomters in 2 hours. What is the average speed the car traveled? show your work.1 solutions Answer 196174 by checkley77(12569)   on 2010-02-08 16:54:11 (Show Source): You can put this solution on YOUR website!DISTANCE=RATE*TIME D=RT R=D/T R=100/2=50 KPH. IS THE SPEED (RATE).
 Probability-and-statistics/267191: A miniature golf course offers a free game to golfers who make a hole-in-one on the last hole. Last week, 44 out of 288 golfers made a hole-in-one on the last hole. Find the experimental probability that a golfer makes a hole-in-one on the last hole. Please round your answer to two decimal places.1 solutions Answer 196172 by checkley77(12569)   on 2010-02-08 16:38:15 (Show Source): You can put this solution on YOUR website!44/288=.1528 or .15 or 15% ans.
 Linear-equations/267192: The Directions Say "Solve The Following System Of Equations." And The Problem Is..... 4x+6y=9 10x-18y=-51 solutions Answer 196171 by checkley77(12569)   on 2010-02-08 16:36:15 (Show Source): You can put this solution on YOUR website!4x+6y=9 multiply by 3 & add. 10x-18y=-5 12x+18y=27 ---------------- 22x=22 x=22/22 x=1 ans. 4*1+6y=9 4+6y=9 6y=9-4 6y=5 y=5/6 ans. Proof: 10*1-18*5/6=-5 10-90/6=-5 10-15=-5 -5=-5
 Rectangles/267194: The length of a rectangle is 2 inches more than its width.The area of the rectangle is 15 square inches. What are the length and width of the rectangle?1 solutions Answer 196170 by checkley77(12569)   on 2010-02-08 16:32:32 (Show Source): You can put this solution on YOUR website!L=W+2 AREA=LW 15=(W+2)W 15=W^2+2W W^2+2W-15=0 (W+5)(W-3)=0 W-3=0 W=3 ANS. L=3+2=5 ANS. 15=3*5 15=15
 Angles/267204: the angle measure is 60 degrees more than it complement find the angle1 solutions Answer 196169 by checkley77(12569)   on 2010-02-08 16:28:20 (Show Source): You can put this solution on YOUR website!x+(x+60)=90 2x=90-60 2x=30 x=15 ans. for the smaller angle. 90-15=75 ans. for the larger angle. Proof: 15+(15+60)=90 90=90
 Exponents-negative-and-fractional/267205: (8x^3y^5/4x^2y^-3)^-1 Simplify1 solutions Answer 196166 by checkley77(12569)   on 2010-02-08 16:25:32 (Show Source): You can put this solution on YOUR website!(8x^3y^5/4x^2y^-3)^-1 (4x^2y^-3)/(8x^3y^5 (4x^2)/(8x^3y^(5+3)) (4x^2/(8x^3y^8) 1/(2x^3-2)y^8 1/(2xy^8) ans.
 Permutations/266394: How many ways can 6 students desks be arranged in a row? explain1 solutions Answer 195722 by checkley77(12569)   on 2010-02-06 19:01:56 (Show Source): You can put this solution on YOUR website!6!=6*5*4*3*2*1=720 different ways these desks can be arrangesd in a row. Any one of the 6 desks can be first. Any one of the remaining 5 desks can be second. Any one of the remaining 4 desks can be third. Any one of the remaining 3 desks can be fourth. Any one of the remaining 2 desks can be fifth The one desk left takes the last place in the row.
 Length-and-distance/266401: factor the trinomial b^2+18b+801 solutions Answer 195720 by checkley77(12569)   on 2010-02-06 18:56:09 (Show Source): You can put this solution on YOUR website! b^2+18b+80 (b+10)(b+8) ans.
 Polynomials-and-rational-expressions/266411: Find a polynomial for the sum of the areas of a circles if the circle has a fadius of 17 and the other has a radius of 81 solutions Answer 195718 by checkley77(12569)   on 2010-02-06 18:53:45 (Show Source): You can put this solution on YOUR website!AREA=PIR^2 AREA=3.14*17^2+3.14*8^2 AREA=3.14*289+3.14*64 AREA=3.14(289+64 AREA=3.14*353 AREA=1,108.42 ANS.
 test/266414: two trains start from the same station and run in opposite directions. one runs at a uniform rate of 30km an hour and the other runs at 35km an hour. in how many hours will they be 195km apart?1 solutions Answer 195716 by checkley77(12569)   on 2010-02-06 18:49:05 (Show Source): You can put this solution on YOUR website!D=RT 195=(30+35)T 195=65T T=195/65 T=3 HOURS AFTER THEY LEAVE THEY WILL BE 195 MILES APART.
 Mixture_Word_Problems/266418: A chemist obtain 18 grams of 10% saline solution from a mixture of 5% saline solution and a 15% saline solution. How much of the 15% saline solution is used in the mixture? 1 solutions Answer 195714 by checkley77(12569)   on 2010-02-06 18:46:07 (Show Source): You can put this solution on YOUR website!.15X+.05(18-X)=.10*18 .15X+.9-.05X=1.8 .10X=1.8-.9 .10X=.9 X=.9/.10 X=9 GRAMS OF 15% SOLTION IS USED. PROOF: .15*9+.05(18-9)=.10*18 1.35+.05*9=1.8 1.35+.45=1.8 1.8=1.8
 Permutations/266419: Kurt, yoel, Jason, Elana and Sara are studying together for a Finite Test. They decide to get a snack. Each is allowed to take one snack item. In how many different ways can the snacks be distributed if there are 6 apples, 5 oranges, 4 pieces of cherry, and 3 blueberry muffins?1 solutions Answer 195713 by checkley77(12569)   on 2010-02-06 18:40:47 (Show Source): You can put this solution on YOUR website!18C5=8,568 POSSIBLE SELECTIONS.
 Miscellaneous_Word_Problems/266420: Six time a certain number minus 2 equals five times the number plus 2. Could you find the number?1 solutions Answer 195711 by checkley77(12569)   on 2010-02-06 18:33:43 (Show Source): You can put this solution on YOUR website!6N-2=5N+2 6N-5N=2+2 N=4 ANS. PROOF: 6*4-2=5*4+2 24-2=20+2 22=22
 Linear-systems/266425: please help me solve this problem category:coins and money 1.Alice is counting a cash register at the end of the night.she has \$1015 in \$5 bills and \$10 bills.if she has 138 bills all together,how many of each type does she has? please help me right away.1 solutions Answer 195710 by checkley77(12569)   on 2010-02-06 18:31:28 (Show Source): You can put this solution on YOUR website!f+t=138 or f=138-t 5(138-t)+10t=1015 690-5t+10t=1015 5t=1015-690 5t=325 t=325/5 t=65 ten dollar bills. f=138-65=73 ten dollar bills. Proof: 5*73+10*65=1015 365+650=1015 1015=1015
 Coordinate-system/266357: How come some of questions are not getting answered?1 solutions Answer 195709 by checkley77(12569)   on 2010-02-06 18:22:40 (Show Source): You can put this solution on YOUR website!How come some of questions are not getting answered? There are two possible answers! Too many questions. OR Too few tutors.
 Graphs/266360: I= prt solve for p; solve for r; solve for t F= 9/5 C + 32 solve for C A= 1/2 Bh solve for B; solve for h A= LW solve for L; solve for W P= 2L + 2W solve for L; solve for W C= 2(3.14))r solve for r G= 3.5M/P solve for M; solve for P D= M/V solve for M; solve for V1 solutions Answer 195708 by checkley77(12569)   on 2010-02-06 18:19:36 (Show Source): You can put this solution on YOUR website!I= prt solve for p; solve for r; solve for t p=I/rt ans r=I/pt ans. t=I/pr ans. F= 9C/5 + 32 solve for C 9C/5=F-32 9C=5(F-32) 9C=5F-160 C=(5F-`60)/9 ans. A= 1/2 Bh solve for B; solve for h a=Bh/2 Bh=2a B=2a/h ans. h=2a/B ans. A= LW solve for L; solve for W L=A/W ANS. W=A/L ANS P= 2L + 2W solve for L; solve for W 2L=P-2W L=(P-2W)/2 ANS. 2W=P-2L W=(P-2L)/W C= 2(3.14)r solve for r r=c/(2*3.14) ans. G= 3.5M/P solve for M; solve for P 3.5M=GP M=GP/3.5 ANS. GP=3.5M P=3.5M/G ANS. D= M/V solve for M; solve for V M=DV ANS. DV=M V=M/D ANS.
 Exponents/266364: {3y3)3 ______ 51 solutions Answer 195707 by checkley77(12569)   on 2010-02-06 18:10:00 (Show Source): You can put this solution on YOUR website!{3y^3)^3 is this what you want? ______ 5
 Systems-of-equations/266368: 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 110 miles per hour. Train A passes a station at 10:15 A.M. If train B passes the same station at 10:27 A.M., at what time will train B catch up to train A? I know the equation is 100t = 110(t - something) I know there is 12 minutes difference, but I do not know how to put 12 minutes in a decimal form. Could someone please help me with this, I would appreciate it very much.1 solutions Answer 195706 by checkley77(12569)   on 2010-02-06 18:06:17 (Show Source): You can put this solution on YOUR website!100t=110(t-12/60) 100t=110(t-1/5) 100t=110t-22 100t-110t=-22 -10t=-22 t=-22/-10 t=2.2 hours after train A leaves the station they will meet. OR: 10:15+2:12=12.27 is the time of the meet. Proof: 100*2.2=110(2.2-1/5) 220=242-22 220=220
 Rectangles/266369: the length of a rectangular field is 7 meters more than twice it width. the perimeter is 140 meters, find the dimension of the field1 solutions Answer 195705 by checkley77(12569)   on 2010-02-06 17:58:46 (Show Source): You can put this solution on YOUR website!L=2W+7 2L+2W=140 2(2W+7)+2W=140 4W+14+2W=140 6W=140-14 6W=126 W=126/6 W=21 ANS. FOR THE WIDTH. L=2*21+7=42+7=49 ANS. FOR THE LENGTH. PROOF: 2*49+2*21=140 98+42=140 140=140
 Exponents/266370: {3y^3/5)^3 1 solutions Answer 195704 by checkley77(12569)   on 2010-02-06 17:55:11 (Show Source): You can put this solution on YOUR website!{3y^3/5)^3 27y^(27/125) ans.