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# Recent problems solved by 'Alan3354'

Alan3354 answered: 31492 problems
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 Exponential-and-logarithmic-functions/457206: simplify by removing factors of 1 r^2-81/r^2-18r+81 I can simplify this to (r-9)(9+r)/r^2+63 but I am not sure what they want or mean by removing the factor of 1 1 solutions Answer 313697 by Alan3354(31513)   on 2011-06-03 19:51:49 (Show Source): You can put this solution on YOUR website!It's not r^2 + 63, it's (r-9)^2
 Polynomials-and-rational-expressions/457210: Hi I am really confused on how to complete this problem. I am in a study plan and very stuck in a section. I need to know where they are getting certain numbers so i can complete the rest of these assignments... 9th rt b^2 * sqrt b^9 I get this b^2/9 b^9/2=b^2/18 b^9/18 from here I am confused. It shows in help that it is b^85/18. Where are they getting 85. The next confusion is after this it shows b^4+13/18. Where are they getting 4+13.. Can anyone help. It would be wonderful. Thank You1 solutions Answer 313696 by Alan3354(31513)   on 2011-06-03 19:50:36 (Show Source): You can put this solution on YOUR website!9th rt b^2 * sqrt b^9 Do you mean ? = Get a common denominator to add exponents = It's hard to see. = b^(4/18)*b^(81/18) = = b^(85/18) --------------------- I get this b^2/9 b^9/2=b^2/18 b^9/18 from here I am confused. It shows in help that it is b^85/18. Where are they getting 85. The next confusion is after this it shows b^4+13/18. Where are they getting 4+13.. Then 85/18 is reduced to a mixed number. = 4 13/18 -->
 Equations/457123: Can someone help me find the solution of this system using the substition method? 3x + 7y = 5 -4x +y = 141 solutions Answer 313676 by Alan3354(31513)   on 2011-06-03 17:58:16 (Show Source): You can put this solution on YOUR website!3x + 7y = 5 -4x +y = 14 ----------- -4x +y = 14 --> y = 4x + 14 Sub for y in the 1st equation
 Surface-area/457176: how do you write a ratio of surface area?1 solutions Answer 313675 by Alan3354(31513)   on 2011-06-03 17:56:07 (Show Source): You can put this solution on YOUR website!A ratio is the relation between 2 items. Surface area and what?
 Triangles/457187: is it a right triangle when one side is 5cm, the other is 7cm and the base is 9cm?1 solutions Answer 313674 by Alan3354(31513)   on 2011-06-03 17:55:04 (Show Source): You can put this solution on YOUR website!If it's a right triangle.
 Trigonometry-basics/457185: Solve 9x^3-18x^2-16x+32. WHAT is the answer and how do i get to the answer? Thank you1 solutions Answer 313673 by Alan3354(31513)   on 2011-06-03 17:54:14 (Show Source): You can put this solution on YOUR website!Step 1, what is it you want to do? It's not an equation, there's no equal sign, so nothing to solve. -------------- WHAT is the answer and how do i get to the answer? The answer to what? What is the question?
 Linear-systems/457165: What is the difference between the solution of a system of linear inequalities? Explain your answer and show with system and graph.1 solutions Answer 313666 by Alan3354(31513)   on 2011-06-03 17:08:10 (Show Source): You can put this solution on YOUR website!At least 2 items are required to have a difference. There cannot be a difference between the solution of anything. ----------- PS For there to be a "same difference", which is commonly said, there have to be 2 differences, which requires a minimum of 3 items. "same difference" usually is mistakenly said when there's no difference, and it's actually "same thing." Making sense seems to be a lost cause. Don't even mention "hopefully."
 Average/457164: Can anyone show me how to solve using the elimination method? x+5y=20 -x+8y=191 solutions Answer 313665 by Alan3354(31513)   on 2011-06-03 17:04:49 (Show Source): You can put this solution on YOUR website!Add the 2 equations.
 Rectangles/457173: i need help please? a rectangle length is 9 cm and width is 4 cm what is the area of the rectangle? thanks1 solutions Answer 313664 by Alan3354(31513)   on 2011-06-03 17:04:11 (Show Source): You can put this solution on YOUR website!You have 2 numbers to work with. What's your best guess?
 Polygons/457166: can you explain to me why the exterior angle of a triangle equals the sum of two interior opposite angles thanks alot1 solutions Answer 313663 by Alan3354(31513)   on 2011-06-03 17:03:29 (Show Source): You can put this solution on YOUR website!The sum of angles in a triangle = 180 degs The sum of any 2 angles = 180 - the 3rd angle -------- The exterior angle also = 180 - the interior angle There's no "why", it just does
 Polygons/457169: hi can you explain to me how to find the size of one interior angle in a regular polygon with 9 sides . thank you 1 solutions Answer 313662 by Alan3354(31513)   on 2011-06-03 17:01:31 (Show Source): You can put this solution on YOUR website!The sum of interior angles = 180*(n-2) degrees, where n = # of sides 180(9-2) = 1260 total 1260/9 = 140 degrees ---------------------- A better way: The sum of exterior angles for all polygons = 360 degs (even a circle) 360/9 = 40 degs exterior 180 - 40 = 140 degs internal
 Evaluation_Word_Problems/457085: Help please Factor the trinomial 0.04s^2 + 0.12s + 0.091 solutions Answer 313645 by Alan3354(31513)   on 2011-06-03 14:26:59 (Show Source): You can put this solution on YOUR website!Hint: If both ends are perfect squares, try that first.
 Expressions-with-variables/457097: Par on a golf course is 72. If a professional golfer shot rounds of 78, 70, and 70 in a tournament, what will she need to shoot on the final round to average par?1 solutions Answer 313636 by Alan3354(31513)   on 2011-06-03 13:36:49 (Show Source): You can put this solution on YOUR website!A 72 average times 4 = 288 total. She has 78 + 70 + 70 = 218 now. 288 - 218 = 70 --------------- PS Golf is very boring, but I like blading on the cart tracks.
 Human-and-algebraic-language/457079: If anyone can show the steps taken to complete this problem it would begreatly appreciated. I have been out of school for quite awhile and am still drawing a blank. (x-3)(2x-7)=01 solutions Answer 313626 by Alan3354(31513)   on 2011-06-03 12:17:45 (Show Source): You can put this solution on YOUR website!(x-3)(2x-7)=0 -------------- If the product is zero, one of the factors must be zero. You can't multiply 2 things and get zero otherwise. ---------------- Either x - 3 = 0 --> x = 3 or 2x - 7 = 0 --> x = 7/2 2 answers: x = 3, x = 7/2
 Linear-systems/457069: y= -3/5x x-2y= -22 so what would be the solution to the system of equations?1 solutions Answer 313625 by Alan3354(31513)   on 2011-06-03 11:59:58 (Show Source): You can put this solution on YOUR website!y= -3/5x x-2y= -22 --------------- Sub for y in the 2nd eqn. x - 2y = -22 x -2(-3x/5) = -22 Solve for x Then solve for y
 Polynomials-and-rational-expressions/457068: The question is: If 3x+5x=-8 Then x+1=? I don't know what im missing, I think I multiply -8 on both sides but what happens to the x on 3x or 5x, please help me understand the steps involved in this problem.1 solutions Answer 313623 by Alan3354(31513)   on 2011-06-03 11:42:34 (Show Source): You can put this solution on YOUR website!If 3x+5x=-8 Then x+1=? 3x + 5x = -8 8x = -8 x = -1 --------- x+1 = -1 + 1 = 0
 Polygons/457022: Hi can you explain to me How you find the number of sides in a regular polygon that has an exterior angle of 72 Thanks1 solutions Answer 313599 by Alan3354(31513)   on 2011-06-03 10:20:34 (Show Source): You can put this solution on YOUR website!The sum of exterior angles of all polygons = 360 360/72 = 5
 Polynomials-and-rational-expressions/456856: how do you solve this rational expression- x^2+2x-24 x^2-361 solutions Answer 313488 by Alan3354(31513)   on 2011-06-02 19:36:56 (Show Source): You can put this solution on YOUR website!Is that one expression or 2? Expressions are not solved, equations are solved.
 Travel_Word_Problems/456869: A certain aircraft can fly 960 miles with the wind in 4 hours and travel the same distance against the wind in 6 hours. what is the speed of the aircraft. what is the speed of wind1 solutions Answer 313487 by Alan3354(31513)   on 2011-06-02 19:35:51 (Show Source): You can put this solution on YOUR website!A certain aircraft can fly 960 miles with the wind in 4 hours and travel the same distance against the wind in 6 hours. what is the speed of the aircraft. what is the speed of wind ------------------ Downwind speed = 960/4 = 240 mph Upwind speed = 960/6 = 160 mph The airspeed is the average = (240 + 160)/2 = 200 mph The windspeed is the difference = 240-200 = 40 mph
 Travel_Word_Problems/456803: if you run at 10km/h for 30minutes , how far have you gone ?1 solutions Answer 313463 by Alan3354(31513)   on 2011-06-02 17:47:53 (Show Source): You can put this solution on YOUR website!Hint: 30 minutes = 1/2 hour
 Inequalities/456832: what is the answer to this? n/5 > - 9/5 1 solutions Answer 313461 by Alan3354(31513)   on 2011-06-02 17:46:24 (Show Source): You can put this solution on YOUR website!what is the answer to this? n/5 > - 9/5 ------------- It depends on the question. If you want to solve for n: n/5 > - 9/5 Multiply by 5 n > -9
 Travel_Word_Problems/456765: How long will it take water to travel 230 miles at a rate of 10 ft/yr?1 solutions Answer 313460 by Alan3354(31513)   on 2011-06-02 17:44:57 (Show Source): You can put this solution on YOUR website!Hint: 1 mile = 5280 ft
 Trigonometry-basics/456804: The value(s) of x when sin(x) = -1 are x = -90° and 270°?1 solutions Answer 313458 by Alan3354(31513)   on 2011-06-02 17:43:20 (Show Source): You can put this solution on YOUR website!That's true. -90 and +270 are coterminal, they get you to the same place. sin(-90) = sin(270) = -1
 test/456754: can someone plss help me by today? ): simplify the complex fraction. 12x2y3/6z5 over 3z7/2xy1 solutions Answer 313456 by Alan3354(31513)   on 2011-06-02 17:38:32 (Show Source): You can put this solution on YOUR website!You show your efforts, and I'll check it for you.
 test/456758: can someone plss help me by today? ): simplify the complex fraction. y-4/y over 1-2/y1 solutions Answer 313455 by Alan3354(31513)   on 2011-06-02 17:37:27 (Show Source): You can put this solution on YOUR website!I just did one like this. Invert the divisor and multiply.
 test/456753: can someone plss help me by today? ): simplify the complex fraction. 3a/b over 2a2/b4 1 solutions Answer 313413 by Alan3354(31513)   on 2011-06-02 14:48:05 (Show Source): You can put this solution on YOUR website!simplify the complex fraction. Invert the divisor and multiply = = =
 Exponents/456713: I have to factor completely. I don't even know what I have to do here. I don't think I can subtract these from one another. Therefore, am I supposed write it out? Please help me understand what to do! 5b^4c^7d^6- 7b^5c^3d^8 1 solutions Answer 313392 by Alan3354(31513)   on 2011-06-02 12:59:37 (Show Source): You can put this solution on YOUR website! --------------- There are 2 terms. Look for common factors. Both have b, c & d, so factor that out. = Both terms still have bcd, so do it again. = And again = Now the 2nd term has no "c", so factor out bd = Only d is common to both now. Factor out d^2, save a step = ----------------------------- That's all. Doing it like that is tedious and time consuming. Here's a different approach: The highest exponent of b is 4. Of c is 3, and of d is 6. --> Divide the 2 terms by that. =
 Quadratic_Equations/456597: What is the Basic tricks to answer a Quadratic Formula?1 solutions Answer 313390 by Alan3354(31513)   on 2011-06-02 12:43:21 (Show Source): You can put this solution on YOUR website!It depends on what the Quadratic Formula asks. It's never spoken to me, tho. ------------------- An important lesson in life is to learn how to say what you mean. It's sometimes called making sense.
 Polynomials-and-rational-expressions/456706: Is 3 the solution of the equation 5y = 18 ? 1 solutions Answer 313389 by Alan3354(31513)   on 2011-06-02 12:39:37 (Show Source): You can put this solution on YOUR website!Is 3 the solution of the equation 5y = 18 --------- If it is, then 5*3 = 18. 15 = 18?? No.
 Coordinate-system/456634: how do u solve A(-7,2)D(8,-3)1 solutions Answer 313354 by Alan3354(31513)   on 2011-06-02 09:00:20 (Show Source): You can put this solution on YOUR website!Solve for what? Those are 2 points. Equations are solved, this is not an equation.
 Square-cubic-other-roots/456506: Hello, i would sincerely appreciate it if someone could help me with this equation: (x^2-5x+5)^(x^2-9x+20) the directions are to "find all real values which satisfy this problem" also, the second part of the problem (x^2-9x+20) is an exponent of the 1st... Thank you so much!1 solutions Answer 313289 by Alan3354(31513)   on 2011-06-01 21:04:20 (Show Source): You can put this solution on YOUR website!It's not clear what you want to do. It's not an equation, there's no equal sign. I see what the exponent is, but ???