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Recent problems solved by 'Alan3354'

Alan3354 answered: 30973 problems
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Quadratic_Equations/463986: factor: the polynomial 2r^2+5r+4 Please show me step by step to get the answer. Thanks 1 solutions Answer 317825 by Alan3354(30993)   on 2011-06-23 22:11:45 (Show Source): You can put this solution on YOUR website! factor: the polynomial 2r^2+5r+4 --------- It's all positive numbers It has to be (2r + a)*(r + b), a & b have to be 1 and 4 or 2 and 2. Since 5 is odd a has to be odd. --> (2r + 1)*(r + 4) That doesn't work, so it can't be factored.

Graphs/463998: If y=4 when x=2,find y when x=16. Identify the Constant variation. Same problem find the solution. Please show me how to work out graphing and these problems. 1 solutions Answer 317821 by Alan3354(30993)   on 2011-06-23 22:00:42 (Show Source): You can put this solution on YOUR website! Not enough info. It could be that y = 2x, y = x+2, y = 7x-10, y = x^2 or some other relation.

Polynomials-and-rational-expressions/463922: I need to simplify the complex fraction by any method -2 ___ ab2 ___ 5 __ a 1 solutions Answer 317807 by Alan3354(30993)   on 2011-06-23 20:10:13 (Show Source): You can put this solution on YOUR website! Invert the divisor and multiply = = =

Quadratic-relations-and-conic-sections/463954: I need help with system of equations with 3 variables. 1. Solve x + y = z -2x – 4y + z = -31 x + y + z = 22 2. 3x – y + 2z = 6 -x + y = 2 x – 2z = –5 3. Solve 2x + 3y + 3z = 5 4x + 5y + 3z = 13 3x + 2y – 2z = 13 1 solutions Answer 317806 by Alan3354(30993)   on 2011-06-23 20:07:46 (Show Source): You can put this solution on YOUR website! What sort of help? What have you tried?

Linear-equations/463963: How do I graph y=x? 1 solutions Answer 317805 by Alan3354(30993)   on 2011-06-23 20:06:49 (Show Source): You can put this solution on YOUR website! It's a straight line, so you need 2 points. Pick 2 values of y or x, plot the points, draw a line thru them.

Polynomials-and-rational-expressions/463938: I am really having a difficult time with this one! Please assist. Multiply and simplify. 11z^5/3p^3 . 9p^6/121z The simplified product is ? 1 solutions Answer 317793 by Alan3354(30993)   on 2011-06-23 19:20:18 (Show Source): You can put this solution on YOUR website! Cancel things, eg the 11 Then the z Then p^3 = Then 3 =

Quadratic-relations-and-conic-sections/463947: The function s(t) = 16t² is used to approximate the distance s, in feet, that an object falls freely from rest in t seconds. Suspended 1053 ft above the water, the bridge over Colorado’s Royal Gorge is the world’s highest bridge. How long would it take an object to fall freely from the bridge? Im not sure of how to solve this equation is there someone who might help with this question. I would appreciate your help. Thank you so much ! 1 solutions Answer 317789 by Alan3354(30993)   on 2011-06-23 19:14:52 (Show Source): You can put this solution on YOUR website! t =~ 8.1125 seconds

Linear-equations/463950: Please answer this question but please do it step by step. Thank you so much. Your help is very appreciated(: Find the slope of the line going through the points (6, -9) and (1, 4). Thanks again. 1 solutions Answer 317786 by Alan3354(30993)   on 2011-06-23 19:10:26 (Show Source): You can put this solution on YOUR website! Slope m = diffy/diffx (change in y over change in x) m = (-9-4)/(6-1) = -13/5 or -2.6 There are not a lot of steps.

Equations/463919: Could you please help me solve the following equation: 1/(x+1) + 1/(x-1) = 1 This is the work that I have done so far: (x-1)+(x+1)=(x-1)(x+1) x-1+x+1=x^2-1 2x=x^2-1 0=x^2-2x-1 That's where I'm stuck, and I'm not even sure that the work I've done so far is correct. I would sincerely appreciate your assistance. 1 solutions Answer 317773 by Alan3354(30993)   on 2011-06-23 18:21:32 (Show Source): You can put this solution on YOUR website! 1/(x+1) + 1/(x-1) = 1 This is the work that I have done so far: (x-1)+(x+1)=(x-1)(x+1) x-1+x+1=x^2-1 2x=x^2-1 0=x^2-2x-1 ----------- That's all correct 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=8 is greater than zero. That means that there are two solutions: . Quadratic expression can be factored: Again, the answer is: 2.41421356237309, -0.414213562373095. Here's your graph: -------------- Ignore the part that says it can be factored.

Numbers_Word_Problems/463935: what is the next two consecutive even numbers more than 580,500? 1 solutions Answer 317770 by Alan3354(30993)   on 2011-06-23 18:12:59 (Show Source): You can put this solution on YOUR website! Add 2, then add 2 again.

Inequalities/463936: Two angles in a triangle are equal and their sum is equal to the third angle in the triangle. What are the measures of each of the three interior angles? 1 solutions Answer 317769 by Alan3354(30993)   on 2011-06-23 18:12:18 (Show Source): You can put this solution on YOUR website! 45, 45, 90 degs

Radicals/463879: slove this equation 3-9=6 y + 5 y-5= y2-25 1 solutions Answer 317764 by Alan3354(30993)   on 2011-06-23 17:43:24 (Show Source): You can put this solution on YOUR website! slove this equation 3-9=6 That's not true. ----------- y + 5 y-5= y2-25 Not sure what that means.

Linear-equations/463835: What is the slope of a line that is parallel to the line represented by the equation y-2x=7? 1 solutions Answer 317726 by Alan3354(30993)   on 2011-06-23 13:55:38 (Show Source): You can put this solution on YOUR website! What is the slope of a line that is parallel to the line represented by the equation y-2x=7? ------------ Slope = 2

Rational-functions/463847: y-3/2 +y/5 =3- y+1/6 solve rational expression? do i find lcd? 1 solutions Answer 317725 by Alan3354(30993)   on 2011-06-23 13:51:27 (Show Source): You can put this solution on YOUR website! y-3/2 +y/5 =3- y+1/6 solve rational expression? do i find lcd? -------- Eliminate the fractions. Whether it's the least CD or not doesn't matter. Use the product of the denominators, that always works. 2*5*6 = 60 y-3/2 +y/5 =3- y+1/6 Do you mean (y-3)/2 +y/5 =3- (y+1)/6 ? 30*(y-3) + 12y = 180 - 10*(y+1) If so, 30y-90 + 12y = 180 -10y-10 42y - 90 = 170 - 10y 52y = 260 y = 5 ------------- Fretting about the LCD just wastes time.

Equations/463821: Solve the equatioon by factoring. Xsquared+5x-24=0 1 solutions Answer 317717 by Alan3354(30993)   on 2011-06-23 11:39:07 (Show Source): You can put this solution on YOUR website! (x+8)*(x-3) = 0 x = -8, 3

Systems-of-equations/463648: Let me try to solve your system of equation 4x + 4y = 16 and 2x + y = 10 using the elimination method. •Multiply the equation 2x + y = 10 by -2; -4x - 2y = -10. •Add the equation 4x + 4y = 16 and the equation -4x - 2y = -10 together; 2y = 6. •Isolate the variable y by dividing both sides of the equation by 2; y = 3. Can anyone tell us why I multiplied the equation 2x + y = 10 by -2? is this correct so far? please help!! 1 solutions Answer 317626 by Alan3354(30993)   on 2011-06-22 19:19:46 (Show Source): You can put this solution on YOUR website! Let me try to solve your system of equation 4x + 4y = 16 and 2x + y = 10 using the elimination method. •Multiply the equation 2x + y = 10 by -2; -4x - 2y = -10. •Add the equation 4x + 4y = 16 and the equation -4x - 2y = -10 together; ----------------- 2y = 6. •Isolate the variable y by dividing both sides of the equation by 2; y = 3. Can anyone tell us why I multiplied the equation 2x + y = 10 by -2? To get the coefficients of x to match. -------------- is this correct so far? please help!! It's correct, y = 3 ------------- Sub for y in 2x + y = 10 2x + 3 = 10 2x = 7 x = 3.5 or 7/2 That's all

Points-lines-and-rays/463640: Solve the following systems of equations and state if any lines are parallel: 9x - 8 = y 8x - 4 = y 1 solutions Answer 317620 by Alan3354(30993)   on 2011-06-22 18:57:55 (Show Source): You can put this solution on YOUR website! 9x - 8 = y 8x - 4 = y ---------- Since they both = y, 9x - 8 = 8x - 4 x = 4 --------- y = 28

Distributive-associative-commutative-properties/463621: what is the answer for 2x-(8x-1)-15 1 solutions Answer 317615 by Alan3354(30993)   on 2011-06-22 18:44:48 (Show Source): You can put this solution on YOUR website! It depends on the question.

Linear-systems/463615: -3x+y=-2 y=-x-6 3x+7y=6 2x+9y+4 radicals and inequalities quadratic functions literal equations exponential functions 1 solutions Answer 317612 by Alan3354(30993)   on 2011-06-22 18:41:00 (Show Source): You can put this solution on YOUR website! Do you have a question?

Linear-equations/463582: I am having problems solving these math problems and was wondering if someone could give me step by step instuction so that I can see where I am going wrong when solving the problem. x+3=2x-7,2y+1=5(y-4),3-5+2x=x-6,2(x-1)=x+11,and 2x-5x=18 1 solutions Answer 317587 by Alan3354(30993)   on 2011-06-22 17:03:48 (Show Source): You can put this solution on YOUR website! How many problems is that?

Graphs/463598: How can one find the solutions of the quadratic equation by using the quadratic formula method? State the formula 1 solutions Answer 317578 by Alan3354(30993)   on 2011-06-22 16:18:46 (Show Source): You can put this solution on YOUR website! For example, 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=81 is greater than zero. That means that there are two solutions: . Quadratic expression can be factored: Again, the answer is: 1, -3.5. Here's your graph:

Equations/463485: 4(x+2)=28 1 solutions Answer 317570 by Alan3354(30993)   on 2011-06-22 13:56:36 (Show Source): You can put this solution on YOUR website! 4(x+2)=28 Divide by 4 x+2 = 7 Subtract 2 x = 5

Mixture_Word_Problems/463460: How would you make 2 liters of Normal Saline D5? (D5=5% w/v dextrose) 1 solutions Answer 317553 by Alan3354(30993)   on 2011-06-22 11:21:43 (Show Source): You can put this solution on YOUR website! I would get two 1 liter bottles.

Parallelograms/463452: find the value of x for which ABCD must be a parallelogram...18-4x,7x+7 is given 1 solutions Answer 317551 by Alan3354(30993)   on 2011-06-22 11:20:24 (Show Source): You can put this solution on YOUR website! Are those the sides? the angles? Insufficient data

Exponents/463445: a^m+1/a^-m-1 how to solve it 1 solutions Answer 317550 by Alan3354(30993)   on 2011-06-22 11:17:03 (Show Source): You can put this solution on YOUR website! It's not an equation, so you can't solve it.

Rectangles/463433: what is the total area of 365cm x 181 cm? and how do i convert to square inch? 1 solutions Answer 317549 by Alan3354(30993)   on 2011-06-22 11:14:58 (Show Source): You can put this solution on YOUR website! what is the total area of 365cm x 181 cm? and how do i convert to square inch? ------------ How is "total area" different from area? Area = 365*181 sq cm, just multiply it. --------------------- 1 inch = 2.54 cm Area = (365/2.54)*(181/2.54) sq inches = (Area in sq cm) divided by 2.54^2

Triangles/463504: Find the length of the hypotenuse of a right triangle whose legs are 3 and √(2) 1 solutions Answer 317548 by Alan3354(30993)   on 2011-06-22 11:10:50 (Show Source): You can put this solution on YOUR website! Find the length of the hypotenuse of a right triangle whose legs are 3 and √(2) ---------------

Graphs/463499: (3x-4y)^2 1 solutions Answer 317546 by Alan3354(30993)   on 2011-06-22 11:03:45 (Show Source): You can put this solution on YOUR website!

Polynomials-and-rational-expressions/463502: Factor. Check by multiplying. 8x^2 + 16x 1 solutions Answer 317545 by Alan3354(30993)   on 2011-06-22 10:56:03 (Show Source): You can put this solution on YOUR website! 8x^2 + 16x = 8x*(x + 2)

Miscellaneous_Word_Problems/463462: how many sets of answer are possible for a true-or-false quiz of 20 questions? 1 solutions Answer 317537 by Alan3354(30993)   on 2011-06-22 09:07:40 (Show Source): You can put this solution on YOUR website! Commonly called 1 Meg

Volume/463346: How many cubic feet are in a cylinder that has a diameter of 8 feet and a height of 12 feet? 1 solutions Answer 317494 by Alan3354(30993)   on 2011-06-21 22:17:50 (Show Source): You can put this solution on YOUR website! radius = 4 ft cf Vol =~ 603 cubic ft