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# Recent problems solved by 'edjones'

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 Expressions-with-variables/95428: Prt=I, solve for r1 solutions Answer 69444 by edjones(7569)   on 2007-08-30 22:56:19 (Show Source): You can put this solution on YOUR website!divide Pt into both sides. EdJones
 Numbers_Word_Problems/95431: what is the lowest number in a group of three consecutive numbers to equal 6001 solutions Answer 69443 by edjones(7569)   on 2007-08-30 22:52:55 (Show Source): You can put this solution on YOUR website!let n=the lowest number n+(n+1)+(n+2)=600 3n+3=600 subtract 3 from both sides. 3n=597 divide 3 into both sides. n=199 EdJones
 Expressions-with-variables/95429: n ___=c-n, solve for n a+b 1 solutions Answer 69442 by edjones(7569)   on 2007-08-30 22:46:44 (Show Source): You can put this solution on YOUR website!Multiply a+b times both sides. n=(a+b)(c-n) n=ac-an+bc-bn add an+bn to both sides. n+an+bn=ac+bc factor n(1+a+b)=c(a+b) divide 1+a+b into both sides. EdJones
 Rational-functions/95382: This question is from textbook Algebra and Trigonometry i dont know what this is realy called but my teacher told use to do this problem & i keep geting lost... can anyone help me? 3a-2b+2c=1 2a+5b=7+5c c+3+4a=3b1 solutions Answer 69434 by edjones(7569)   on 2007-08-30 21:22:16 (Show Source): You can put this solution on YOUR website!This problem is a long tough grind but we can do it. Because so there is so much manipulation it is easy to make an error. The technical term for what we will do is Gaussian Elimination. Let's line up all the unknowns, one under the other. X.3a-2b+2c=1 Y.2a+5b-5c=7 Z.4a-3b+c=-3 Multiply -2 times equation Z and add Z to X. X.3a-2b+2c=1 Z.-8a+6b-2c=6 ------------- X.-5a+4b=7 this is the sum of X and Z and is the new X. Notice c=0 and the equation is simpler X.-5a+4b=7 Y.2a+5b-5c=7 Z.4a-3b+c=-3 Multiply 5 times Z and add it to Y Y. 2a+5b-5c=7 Z. 20a-15b+5c=-15 ----------------- =>22a-10b=8 this is the new Y. X.-5a+4b=7 Y.22a-10b=8 Z.4a-3b+c=-3 Multiply 2.5 times X and add X and Y X.-12.5a+10b=17.5 Y.22a-10b=8 -------------- =>9.5a=9.5 a=1 Eureka! the rest is easy. X. -5+4b=7 4b=12 b=3 Z. 4-9+c=-3 c=-3+5=2 Answer a=1, b=3, c=2 Check: (plug into the original equations) 3a-2b+2c=1 3-6+4=1 2a+5b=7+5c 2+15=7+10 c+3+4a=3b 2+3+4=9 EdJones
 Graphs/95384: can U help me with stuff like solving [EXAMPLEE]:3x-9=27?? ~adryan4life1@yahoo.com~1 solutions Answer 69399 by edjones(7569)   on 2007-08-30 19:45:12 (Show Source): You can put this solution on YOUR website!3x-9=2 add 9 to both sides. 3x=2+9=11 divide 3 into both sides. x=11/3 EdJones
 Numbers_Word_Problems/89575: Dear Tutors, Here is my word problem that I am having difficulty with - At the beginning of the day a 100 lb. watermelon is 99% water. At the end of the day it is 98% water. How much does the watermelon weigh at the end of the day? I don't know how to start this and I am not sure if it is some kind of trick problem. The only thing I can come up with is 100 x 1/99 + 100 x 1/98 = 1 but I don't think that is right. Help! Thank you, Debra1 solutions Answer 69397 by edjones(7569)   on 2007-08-30 19:41:38 (Show Source): You can put this solution on YOUR website!You are correct. You can't tell how much it weighs. Very good! If the problem said that the watermelon was 99% water BY WEIGHT then we could solv the problem and the answer would be 99 lbs. EdJones
 Graphs/95351: I need to find the y-intercept and the x intercept in this equation but im stuck, please help. 6x+3y=541 solutions Answer 69396 by edjones(7569)   on 2007-08-30 19:27:02 (Show Source): You can put this solution on YOUR website!6x+3y=54 When x=0 3y=54 y=18 (0,18) the x intercept. when y=0 6x=54 x=9 (9,0) the y intercept EdJones
 Inequalities/95366: what is another solution to 144 besides 12 squared1 solutions Answer 69395 by edjones(7569)   on 2007-08-30 19:18:57 (Show Source): You can put this solution on YOUR website!144 is not a question.
 expressions/95380: 7 more than the product of 6 and a number1 solutions Answer 69394 by edjones(7569)   on 2007-08-30 19:16:10 (Show Source): You can put this solution on YOUR website!6x+7
 Expressions-with-variables/95379: This question is from textbook Number of hours in m minutes1 solutions Answer 69393 by edjones(7569)   on 2007-08-30 19:14:52 (Show Source): You can put this solution on YOUR website! EdJones
 test/95373: x+6=3(5-x)1 solutions Answer 69392 by edjones(7569)   on 2007-08-30 19:13:10 (Show Source): You can put this solution on YOUR website!x+6=15-3x add 3x to each side. 4x+6=15 subtract6 from each side. 4x=9 divide 4 into each side. x=9/4 EdJones
 real-numbers/95219: Let a, b, c, be positive real numbers. If ab=48, bc=96, and ac=72, what is the value of abc?1 solutions Answer 69295 by edjones(7569)   on 2007-08-30 00:12:04 (Show Source): You can put this solution on YOUR website! so c=2a divide 2 into each side take square root of both sides a=6 a=-6 Positive numbers are required so a=6 is an answer. ac=6c=72 c=72/6=12 ab=6b=48 b=48/6=8 Check: bc=8*12=96 EdJones
 Linear-equations/95220: This question is from textbook Precalculus with limits I am in pre-cal, but none of my previous classes mentioned general form, and my book doesn't say how to get it from any two points not intercepts. Help? Please? The points for the problem are (-8,1) and (-8,7).1 solutions Answer 69293 by edjones(7569)   on 2007-08-29 23:51:25 (Show Source): You can put this solution on YOUR website!(-8,1) and (-8,7) General Form: Ax+By+C=0 slope-intercept form: y=mx+b 1st we get the slope (m) m=(1-7)/-8+8 m=-6/0=undefined because division is not allowed. We have to stop there. We can't write an equation without the slope.
 Geometric_formulas/95210: A rectangle is three times as long as it is wide. If its length and width are both decreased by 2cm, its area is decreased by 36 cm sqaure. Find its original dimensions.1 solutions Answer 69291 by edjones(7569)   on 2007-08-29 23:28:03 (Show Source): You can put this solution on YOUR website!L*W=A L=3W (3w-2)*(w-2)=A-36 subtract from both sides. -8w+4=-36 multiply -1 times both sides. 8w-4=36 add 4 to both sides. 8w=40 divide 8 into both sides. w=5 cm Ans. Check 5*15=75 (original area) 3*13=39 (area after -2cm subtacted from each side) 75-39=36 cm sq. (difference in the 2 areas) right on! EdJones
 Polynomials-and-rational-expressions/95200: Multiply. Simplify if possible x^2+16x+63/x^2+17x+72 X x^2+8x/x^2+2x-35 A)x(x+8)/x-5 B)1/x-5 C)x/x-5 D)x/x^2+17x+72 1 solutions Answer 69282 by edjones(7569)   on 2007-08-29 22:21:55 (Show Source): You can put this solution on YOUR website!* EdJones
 Polynomials-and-rational-expressions/95204: Five divided by the difference of a number and 12 equals the quotient of 10 and the sum of the number and 5. Find the number. A)-19 B)29/3 C)29 D)17/51 solutions Answer 69274 by edjones(7569)   on 2007-08-29 21:54:11 (Show Source): You can put this solution on YOUR website! multiply (x+5) and (x-12) times both sides. 10(x-12)=5(x+5) 10x-120=5x+25 subtract 5x from both sides. 5x-120=25 add 120 to both sides. 5x=145 divide 5 into both sides. x=29 Ed Jones
 Angles/95197: This question is from the textbook called integrated algebra chapter 2 section 2.4 and it is number 35. My Question: An angle whose supplement is 20 degrees more than twice its compliment. - I need to find the measure of the given angles. If you can help me that would be great. Thank you very much. ISBN-13 :978-0-07-330917-0 ISBN 10: 0-07-330917-61 solutions Answer 69262 by edjones(7569)   on 2007-08-29 21:40:31 (Show Source): You can put this solution on YOUR website!angle=x Compliment=90-x Suppliment=180-x 180-x=2(90-x)+20 180-x=180-2x+20 add 2x to both sides. 180+x=200 subtract 180 from both sides x=20 degrees (Ans.) compliment=70 Suppliment=160 Twice the compliment + 20 = the suppliment EdJones
 Length-and-distance/95191: Chelsea left the White House and traveled towards the capital at an average speed of 34 km/h. Jasmine left at the same time and traveled in the opposite direction with an avg speed of 65 km/h. Find the number of hours Jasmine needs to travel before they are 59.4 km apart. I got T = .91 hours Is this correct? 1 solutions Answer 69253 by edjones(7569)   on 2007-08-29 21:23:33 (Show Source): You can put this solution on YOUR website!No. Since they are going in opposite directions you add the speeds. d=tv distance =time * velocity d=59.4 v=34+65=99 59.4=99t divide 99 into both sides. t=59.4/99=.6 hrs .6 hrs=.6*60=36 minutes EdJones
 Expressions-with-variables/95192: What is the difference of 10 and u 1 solutions Answer 69249 by edjones(7569)   on 2007-08-29 21:06:38 (Show Source): You can put this solution on YOUR website!10-u
 Travel_Word_Problems/95193: Please help me with this word problem? Britney's flight to Rome leaves New York City at 5:15 pm on Wednesday. The flight time is 7.5 hours. If Rome is 6 hours ahead of New York City, use Rome time to determine when she is scheduled to arrive. Do I use the formula d = r * t?1 solutions Answer 69248 by edjones(7569)   on 2007-08-29 21:05:47 (Show Source): You can put this solution on YOUR website!5:15PM NYT depart NY 7:30h Flight time (7.5h = 7:30h on a digital clock) ----- 12:45AM NYT arrival in Rome 6:00 add on for Rome time ----- 6:45AM Rome Time arrival in Rome EdJones
 Travel_Word_Problems/95187: Please help me with this word problem? Britney's flight to Rome leaves New York at 5:15 pm on Wednesday. The flight time is 7.5 hours. If Rome is 6 hours ahead of New York City, use Rome time to determine when she is scheduled to arrive.1 solutions Answer 69247 by edjones(7569)   on 2007-08-29 21:02:40 (Show Source): You can put this solution on YOUR website! 5:15PM NYT depart NY 7:30h Flight time (7.5h = 7:30h on a digital clock) ----- 12:45AM NYT arrival in Rome 6:00 add on for Rome time ----- 6:45AM Rome Time arrival in Rome EdJones
 percentage/95183: Sales decreased 3% from last year. Sales this year are \$164,916. Find the amount of last years sales.1 solutions Answer 69245 by edjones(7569)   on 2007-08-29 20:44:25 (Show Source): You can put this solution on YOUR website!this one is practical and important. x=last yrs. sales. .97x=164,916 divide .97 into both sides. x=\$170,016.49 Ed Jones
 Linear-equations/95043: Please help: The daily low temperatures in degrees Fahrenheit for a certain week were -3,1,4,-5,-10. What is the range of low temperatures for that week?1 solutions Answer 69244 by edjones(7569)   on 2007-08-29 20:37:13 (Show Source): You can put this solution on YOUR website!-10 to 4
 expressions/94990: 6x+2 for x=31 solutions Answer 69141 by edjones(7569)   on 2007-08-29 00:25:13 (Show Source): You can put this solution on YOUR website!(6*3)+2=18+2=20
 Equations/94995: Ms. Smith went on a diet and lost 10pounds which was 6% of her body weight before she started her diet. What was her weight before and after dieting?1 solutions Answer 69140 by edjones(7569)   on 2007-08-29 00:23:14 (Show Source): You can put this solution on YOUR website!b=wt before diet b*.06=10 divde .06 into both sides. lbs EdJones
 Distributive-associative-commutative-properties/95004: -3x^2( x^5 ( x+3) -4x(x^2-5)+50) Please help me with this one! I have no idea what I'm supposed to do.Please and thank you soo much!1 solutions Answer 69139 by edjones(7569)   on 2007-08-29 00:15:21 (Show Source): You can put this solution on YOUR website!Let's start with x^5(x+3)=x^6+3x^5 Next -4x(x^2-5)=-4x^3+20x so now we've got 3x^2(x^6+3x^5-4x^3+20x+50) the rest is easy. (joke) 3x^8+9x^7-12x^5+60x^3+150x^2 Anyone can make a mistake in doing these because ther are so many steps and the only way to check is to do it over. EdJones
 Polynomials-and-rational-expressions/95012: This question is from textbook algebra Factor each of tghe following polynomials completely. -3s^2 - 10s +81 solutions Answer 69136 by edjones(7569)   on 2007-08-28 23:51:37 (Show Source): You can put this solution on YOUR website!(3s-2)(-s-4) EdJones
 Polynomials-and-rational-expressions/95010: This question is from textbook algebra The area of a rectangle of length x is given by 3x^2+5x. Find the width of the rectangle.1 solutions Answer 69134 by edjones(7569)   on 2007-08-28 23:34:17 (Show Source): You can put this solution on YOUR website!Length*Width=Area L*W=A EdJones
 Probability-and-statistics/94936: One urn contains 3 red and 7 white marbles. A second urn contains 2 red and 8 white marbles. One urn is selected and a ball drawn. The probability of selecting the first urn is 0.4 and the probability of selecting the second is 0.6. If a white ball is drawn, find the probability it came from the second urn. 1 solutions Answer 69109 by edjones(7569)   on 2007-08-28 20:51:52 (Show Source): You can put this solution on YOUR website!Urn#1 .4*.7=.28 Urn#2 .6*.8=.48 .28+.48=.76 Notice that the probabilities don't add up to 1.00 That's because we have excluded the possibility of getting a red ball from either of the urns. (the missing .24) probability the ball came from urn#2 EdJones
 Inequalities/94925: This question is from textbook Algebra Word Problems with Inequalities: Betty earns a salary of \$14,000 per year plus and 8% commission on all her sales. How much must her sales be if her annual income is to be no less than \$15,600? 1 solutions Answer 69104 by edjones(7569)   on 2007-08-28 20:15:36 (Show Source): You can put this solution on YOUR website!S=sales salary=14,000 14000+.08S>=15600 subtract 14000 from each side. .08S>=1600 divide .08 into both sides. S>=\$20,000. So she must have sales greater than or equal to \$20,000. EdJones
 Graphs/94920: I have the following equation: y = -x How do I solve the equation, then use a table of values to graph the equation?1 solutions Answer 69094 by edjones(7569)   on 2007-08-28 19:34:27 (Show Source): You can put this solution on YOUR website!y=-x The equation is solved for Y already! All we have to do is put some dots on graph paper so we can draw a straight line if x=0 then y=0 (0,0)(a dot) if x=1 then y=-1 (1,-1)(another dot) if x=-1 then y=1 (-1,1) (a 3rd dot) your graph should look like the graph below. EdJones