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# Recent problems solved by 'edjones'

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 Surface-area/103539: How to find the minimum and maximum possible area for rectangles with measurements of 8 cm x 10 cm1 solutions Answer 75313 by edjones(7569)   on 2007-10-11 00:24:10 (Show Source): You can put this solution on YOUR website!They are all 80 cm.
 Linear-equations/103039: This question is from textbook Intermediate Algebra Graph the union or intersection The intersection of 2x > y and y > x + 21 solutions Answer 75312 by edjones(7569)   on 2007-10-11 00:21:33 (Show Source):
 Finance/103603: Hey, I was given this word proble, but I am having difficulties understanding it. Here it is: What is the maximum amount of postage you can pay using a combination of 5cent and 11cent stamps. It seems to me that they are missing something, but maybe I'm wrong. Thanks for the help. 1 solutions Answer 75311 by edjones(7569)   on 2007-10-11 00:09:41 (Show Source): You can put this solution on YOUR website!Something IS missing.
 Quadratic_Equations/103594: 18. Graph the quadratic equation after completing the given table of values. y = –x^2 – 2x x y –3 –2 –1 0 1 1 solutions Answer 75310 by edjones(7569)   on 2007-10-11 00:08:06 (Show Source): You can put this solution on YOUR website!y = –x^2 – 2x I'll do the 1st one and you can do the rest. y=(-3)^2-2*-3 y=9+6=15 You shold have no trouble. Just replace x with the number in the table, sign included. Be sure to put the negative numbers in parentheses before you square them. Ed
 sets-and-operations/103599: I've been on this problem for almost 2 hours and I'm getting more and more frustrated. Solve each of the following systems by substitution 28. 4x - 12y = 5 -x + 3y = -1 This is one of the answers I got, but none of my answers are right when I try to check them y = -x - (-1)/3 y = -x +1/3 4x - 12(-x +1/3) = 5 4x + 12x (-12)/3 = 5 16x - 12x / 3 = 5 4x/ 3= 5 4x = 5(3) x = 15/4 x = 3.75 What am I missing??? Please advise... Thank you Rev. B 1 solutions Answer 75306 by edjones(7569)   on 2007-10-10 23:55:53 (Show Source): You can put this solution on YOUR website!A) 4x - 12y = 5 B) -x + 3y = -1 . B) -x=-3y-1 x=3y+1 . 4(3y+1)-12y=5 12y+4-12y=5 0y=1 . There is no answer to this system. Why? Because these 2 lines have the same slope. They are parallel. A) y=x/3-(5/12) B) y=x/3-(1/3) the slope is 1/3 for both equations. Ed .
 decimal-numbers/103602: 56 is 8% of what number? 1 solutions Answer 75305 by edjones(7569)   on 2007-10-10 23:32:17 (Show Source): You can put this solution on YOUR website!Let x be the number. .08x=56 x=56/.08 divide each side by .08 x=700 Ed
 Quadratic_Equations/103577: This question is from textbook algebra Solve by completing the square. 4x^2 + 2x – 3 = 0 1 solutions Answer 75303 by edjones(7569)   on 2007-10-10 23:05:51 (Show Source): You can put this solution on YOUR website!4x^2 + 2x – 3 = 0 x^2+.5x-.75=0 divide the equation by 4 to make the coeficient of the 1st term 1. x^2+.5x =.75 x^2+.5x+.0625=.75+.0625 Divide the 2nd term by 2 and square the result and make it the new 3rd term and add it to the right side. Now we have a perfect square on the left. (x+.25)^2=.8125 factor the left and combine on the right. x+.25=+-sqrt(.8125) x=-.25+-sqrt(.8125) x=-1.1514, x=0.6514
 Quadratic_Equations/103587: Is the following trinomial a perfect square? x^2 + 2x – 1 1 solutions Answer 75301 by edjones(7569)   on 2007-10-10 22:41:03 (Show Source): You can put this solution on YOUR website!x^2 + 2x – 1 To find out if any quadratic equation is a perfect square take the middle term (+2), divide it in half (1) and square it (1). 1 should be the final term but the final term is (-1) so the equation is not a perfect square. Ed
Quadratic_Equations/103581: This question is from textbook algebra
1 solutions

Answer 75300 by edjones(7569)   on 2007-10-10 22:34:27 (Show Source):
You can put this solution on YOUR website!
–9(x – 3)^2 = –7
-9(x^2-6x+9)=-7 square what is in the parenthesis 1st.
-9x^2+54x-81=-7
-9x^2+54x-74=0
9x^2-54+74=0 multiply both sides times -1.
 Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc) Quadratic equation (in our case ) has the following solutons: For these solutions to exist, the discriminant should not be a negative number. First, we need to compute the discriminant : . Discriminant d=252 is greater than zero. That means that there are two solutions: . Quadratic expression can be factored: Again, the answer is: 3.8819171036882, 2.1180828963118. Here's your graph:

 Quadratic_Equations/103565: I need help with this one (m^4)^3(m^2)^9 over, (m^3)^2 A) m^5 B) m^3 C) m^24 D) m^13 1 solutions Answer 75299 by edjones(7569)   on 2007-10-10 22:15:11 (Show Source): You can put this solution on YOUR website! = = = Ed
 Quadratic_Equations/103567: I dont understand this one!!! Give the degree. 6x A) 0 B) 1 C) 6 1 solutions Answer 75298 by edjones(7569)   on 2007-10-10 22:02:27 (Show Source): You can put this solution on YOUR website!x^2 is 2nd deg. x^5 is 5th deg. 6x is 1st deg.
 Equations/103575: This question is from textbook How would you solve x/3+2=-5 ?1 solutions Answer 75297 by edjones(7569)   on 2007-10-10 21:59:32 (Show Source): You can put this solution on YOUR website!x/3+2=-5 x+6=-15 multiply both sides by 3. x=-6-15 subtract 6 from both sides. x=-21 Ed
 Expressions-with-variables/103573: This question is from textbook prentice hall SOLVE. 25. 7 1/2x - 1/2x = 3 3/4x + 391 solutions Answer 75296 by edjones(7569)   on 2007-10-10 21:56:39 (Show Source): You can put this solution on YOUR website! 7 1/2x - 1/2x = 3 3/4x + 39 15/2x-1/2x=15/4x+39 Get rid of the fractions; multiply both sides by 4. 30x-2x=15x+156 28x-15x=156 subtract 15x from each side. 13x=156 x=12 divide both sides by 13. Check: 90-6=45+39 84=84 Ed
 Quadratic_Equations/103569: I dont even know where to start Find the value of the polynomial x3 – 4x when x = –2. A) –2 B) 0 C) 2 D) 14 1 solutions Answer 75295 by edjones(7569)   on 2007-10-10 21:44:54 (Show Source): You can put this solution on YOUR website!x3 – 4x Start by substituting -2 for x. -2^3-4*-2=-8+8=0 Ed
 Quadratic_Equations/103571: Can someone please help me with this one. Evaluate. 3^–5 A) –15 B) –243 C) 1/243 D) -1/243 1 solutions Answer 75292 by edjones(7569)   on 2007-10-10 21:37:56 (Show Source): You can put this solution on YOUR website!C 3^-5=1/3^5
Money_Word_Problems/103385: If two opposite sides of a square are increased by 9 meters and the other sides are decreased by 6 meters, the area of the rectangle that is formed is 78 square meters. Find the area of the original square.
1 solutions

Answer 75183 by edjones(7569)   on 2007-10-10 12:50:43 (Show Source):
You can put this solution on YOUR website!
let x=original sides of the square.
A=L*W
(x+9)(x-6)=78
x^2+3x-54=78
x^2+3x-132=0
 Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc) Quadratic equation (in our case ) has the following solutons: For these solutions to exist, the discriminant should not be a negative number. First, we need to compute the discriminant : . Discriminant d=537 is greater than zero. That means that there are two solutions: . Quadratic expression can be factored: Again, the answer is: 10.0866302262565, -13.0866302262565. Here's your graph:

The area of the original square=(10.0866...)= 101.74 sq meters
Ed

 Linear-equations/103386: What are the x-intercept and y-intercept of the line 4x - 5y =20?1 solutions Answer 75180 by edjones(7569)   on 2007-10-10 12:24:21 (Show Source): You can put this solution on YOUR website!4x-5y=20 y intercept is when x=0 -5y=20 y=-4 x intercept is when y=0 4x=20 x=5 Ed
 Linear-equations/103377: find the slope and the y-intercept of -8x-5y=-101 solutions Answer 75179 by edjones(7569)   on 2007-10-10 12:11:01 (Show Source): You can put this solution on YOUR website!slope=(m) y=mx+b -8x-5y=-10 -5y=8x-10 m=-8/5 y intercept occurs when x=0 when x=0 y=2 Ed
 Equations/103223: I need help in solving this equation solve if possible... 8 - 9t = 21t - 17 I get - 9t = -9 -t = 11 solutions Answer 75095 by edjones(7569)   on 2007-10-09 20:17:59 (Show Source): You can put this solution on YOUR website!8-9t=21t-17 25=30t add 9t and 17 to both sides. t=25/30=5/6 divide each side by 30. Check: 8-9*(5/6)=21*(5/6)-17 8-45/6=105/6-17 48-45=105-102 multiply both sides times 6. 3=3 Ed
 Square-cubic-other-roots/103261: Solve: x to the 5th divided by 4x squared1 solutions Answer 75089 by edjones(7569)   on 2007-10-09 19:53:44 (Show Source):
 Expressions-with-variables/103236: It's been a long time since I've done Algebra and I don't know how to help my daughter with this one.... A banana contains 3 more milligrams (mg) of calcium than an apple and 40 mg of calcium less than an orange. How much calcium is there in an orange if it contains the same amount as 5 apples and a banana. I'd like to see how this is written out in equation form....not just get the answer.1 solutions Answer 75088 by edjones(7569)   on 2007-10-09 19:47:52 (Show Source): You can put this solution on YOUR website!a=mg of Ca in an apple, b=mg of Ca in a bannana, g=mg of Ca in an orange b=a+3...a=b-3 g=b+40 g=5a+b...g=5(b-3)+b...g=5b-15+b...g=6b-15...g-6b=-15 . g=b+40 C) g-6b=-15 . replace b+40 for g in equation C) b+40-6b=-15 -5b+40=-15 -5b=-55 subtract 40 from each side. b=11 mg divide each by -5. a=8 mg g=51 mg . Ed
 Polynomials-and-rational-expressions/103234: I'm suppose to solve this problem by using synthetic division and the factor theorem. I already solved all of my homework problems, but this is the only one I cant figure out because of the fractions. Please help!! Tanks!! Solve: 1 solutions Answer 75079 by edjones(7569)   on 2007-10-09 19:07:45 (Show Source): You can put this solution on YOUR website!multiply both sides times 6 to get rid of the fractions. 6x^3-5x^2-44x+15=0 Now you can use the sythetic division. x=3 may be a zero, so try the division by (x-3) Ed
 Travel_Word_Problems/103225: One student can mow a yard in 3 hours; another student, in 4 hours. About how long would it take if they work together? Please show me how you got the answer.1 solutions Answer 75076 by edjones(7569)   on 2007-10-09 18:51:12 (Show Source): You can put this solution on YOUR website!In work problems turn things upside down; add them; turn them right side up for the answer. 1st student: does 1/3 of the job in 1 hr 2nd student: does 1/4 fo the job in 1 hr . 1/3+1/4=4/12+3/12=7/12 of the job gets done in 1 hr by both of them. . 12/7 hrs it takes them to do it together or 1 hr 5/7 or about 1 hr 43 min Ed
 Equations/103226: Confusing fraction equation of Solve if possible 1/4(60 + 16s) = 15 + 4s I get 15 + 4s = 15 + 4s and then not sure where to take it after this1 solutions Answer 75075 by edjones(7569)   on 2007-10-09 18:40:36 (Show Source): You can put this solution on YOUR website!So far so good. 15 + 4s = 15 + 4s s can be any number. Ed
 Angles/75259: Can you please help me solve this: You have collected data on several buildings. For each building, you are given the angle of the line of sight up to the top of the building, and the distance to the building. Calculate the height of each building. Building 5 Angle 1º Distance 500 meters1 solutions Answer 75074 by edjones(7569)   on 2007-10-09 18:35:02 (Show Source): You can put this solution on YOUR website!tan(x)=opp/adj tan(1)=opp/500 1.55741=opp/500 opp=1.55741*500=778.7 m tall Ed
 Linear-systems/103128: This question is from textbook in 1997, france was most visited country in the world and the US was the 2nd most most visited. a total of 116 million people visited one of the 2 countries . if 18 million more people visited france than the US, how many people visited each country...? this was just actually given by our teacher..1 solutions Answer 75073 by edjones(7569)   on 2007-10-09 18:23:38 (Show Source): You can put this solution on YOUR website!u=visitors to usa. . u+u+18=116 2u+18=116 2u=98 u=49 million visited usa 49+18=67 million visited France Check: 67+49=116 Ed
 Distributive-associative-commutative-properties/103221: This question is from textbook How do I use the distributative property to simplify (43)(9)? I'm not sure how to do it when both numbers are in parentheses? Thanks for your help.1 solutions Answer 75072 by edjones(7569)   on 2007-10-09 18:15:44 (Show Source): You can put this solution on YOUR website!43*9=387
 Polynomials-and-rational-expressions/103219: Please help! Subtract and write in simplest form. (3 / x^2+4x+3) - (1 / x^2-9) I just can't seem to figure out the LCD. If the first expression breaks down to (x+3)and (x+1) and the second expression breaks down to (x-3) and (x+3), I tried to get the LCD from (x-3)(x+3) and (x+1) but then there would be no middle term. Please help! Thanks so much!1 solutions Answer 75071 by edjones(7569)   on 2007-10-09 18:14:30 (Show Source): You can put this solution on YOUR website!you have done it all! Ed
 Polynomials-and-rational-expressions/103220: Please help! Add and use simplest form. (4y / y^2+6y+5) + (2y / y^2-1) I cannot figure out the LCD. The first expression breaks down to (y+5) and (y+1) and the second expression breaks down to (y-1) and (y+1). After that, I am lost. Please help! Thanks so much!1 solutions Answer 75070 by edjones(7569)   on 2007-10-09 18:08:12 (Show Source): You can put this solution on YOUR website!Good work so far. You did the hard part. So, y+1, y-1, y+5 are the LCD . Answer Ed
 Polynomials-and-rational-expressions/103206: How do you solve? 1 solutions Answer 75069 by edjones(7569)   on 2007-10-09 17:59:46 (Show Source): You can put this solution on YOUR website! Factor. multiply both sides times (x-1)(x+1) 3x+3-6=x^2-1 Expand. x^2-3x+2=0 subtract 3x-3 from each side. (x-1)(x-2)=0 x=2, x=1 x=1 gives a division by zero error in the original equation. x=2 is the only answer. Check: 3/1-6/3=1...3-2=1 Ed