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# Recent problems solved by 'richwmiller'

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 Mixture_Word_Problems/290177: I have 2 problems, hear they are. A gallon of vinegar is labelled 5% acidity. How many fluid Ounces of pure acid must be added to get 6% acidity? 1 solutions Answer 209988 by richwmiller(9135)   on 2010-04-08 22:51:12 (Show Source): You can put this solution on YOUR website!Guess what? This website has rules. "Hear" are some of them. One problem at a time. No similar problems. Limit 4 problems daily. (128*.05)+x=.06*(x+128) x=1.3617
 Age_Word_Problems/290132: The ages of a father and a son add up to 55. The father's age is the sons age reversed.1 solutions Answer 209982 by richwmiller(9135)   on 2010-04-08 21:32:04 (Show Source): You can put this solution on YOUR website!10a+b+10b+a=55 11a+11b=55 11*(a+b)=55 a+b=5 x+y=55 x=10a+b y=10b+a Not enough info. There are three possibilities 05,50 14,41 23,32
 Inverses/290153: What is the reciprocal for x+3? I figured out all the fractions but im not sure how to do a basic addition problem.1 solutions Answer 209980 by richwmiller(9135)   on 2010-04-08 21:17:56 (Show Source): You can put this solution on YOUR website!Think of it as y reciprocal of y is 1/y so we get 1/(x+3)
 Polynomials-and-rational-expressions/290150: y=4x1 solutions Answer 209979 by richwmiller(9135)   on 2010-04-08 21:16:18 (Show Source): You can put this solution on YOUR website!Is there a question?
 Linear-systems/290141: When graphing the system y is greater than or equal to -2x-1 and y is less than -4 what quadrant does the overlap occur? Using the graphing method what is the point of intersection for this system 5x-y=4 4x+2y=6 thank you1 solutions Answer 209978 by richwmiller(9135)   on 2010-04-08 21:15:02 (Show Source): You can put this solution on YOUR website!one problem at a time no similar problems limit 4 problems a day
 Quadratic_Equations/290144: what is the solution set of the equation 3x^2=48?1 solutions Answer 209977 by richwmiller(9135)   on 2010-04-08 21:13:07 (Show Source): You can put this solution on YOUR website! 3x^2=48 x^2=16 x=4, and x=-4
 Quadratic_Equations/290118: how do I factor (p+q)squared-2(p+q)-15 thank you!1 solutions Answer 209975 by richwmiller(9135)   on 2010-04-08 21:11:07 (Show Source): You can put this solution on YOUR website!(p+q)^2-2(p+q)-15 Think of (p+q) as x x^2-2x-15 (x-5)(x+3) (p+q-5)(p+q+3) (p+q)^2-2(p+q)-15 You could work it out to p^2+2pq-2p+q^2-2q-15 But either way you get (p+q-5)(p+q+3)
 absolute-value/290102: how to solve one half x minus three equals negative seven1 solutions Answer 209957 by richwmiller(9135)   on 2010-04-08 19:13:47 (Show Source): You can put this solution on YOUR website!This has absolutely nothing to do with the category you chose. Try to write as if you were a math person. 1/2*x-3=-7 add 3 to both sides multiply both sides by 2 all done
 Divisibility_and_Prime_Numbers/290091: Find the quotient and remaineder when dividing by I can't decide whether I am supposed to use long division (the two number divisor), or synthetic (the missing power). If using long, I am having a little trouble with the power divided by another power (the first part). 1 solutions Answer 209955 by richwmiller(9135)   on 2010-04-08 19:11:13 (Show Source): You can put this solution on YOUR website!It doesn't matter which method you use. x^2 goes into x^4 --x^2 times because x^2*x^2=x^4 quotient is x^2-4 with a remainder of 5x-4 so it is x^2-4+(5x-4)/(x^+1)
 Permutations/290098: In a multiple choice test, there are 5 questions and 4 choices of A, B, C or D. How many ways are there of answering without picking the same answer for 2 consecutive answers? 1 solutions Answer 209954 by richwmiller(9135)   on 2010-04-08 19:04:10 (Show Source): You can put this solution on YOUR website!One problem at a time and no similar problems.
 Linear-equations/290094: What is the inherent meaning and justification of cross-multiplication as it applies to solving an inequality?1 solutions Answer 209952 by richwmiller(9135)   on 2010-04-08 19:02:41 (Show Source): You can put this solution on YOUR website!Cross multiplication used to be frowned on by teachers because you aren't obviously doing the same thing to both sides. 3/4=x/7 The proper way is to multiply both sides by 4 3*4/4=x*4/7 3=4x/7 then multiply both sides by 7 3*7=4x*7/7 simplify 3*7=4x but with cross multiplication we skip the step of showing that we multiply one side by each number. 3/4=x/7 we jump right to the result 3*7=4x It is shorter and therefore preferred by students. However there is more chance of errors and not really understanding what you are doing and why.
 Systems-of-equations/290093: (Not quite sure if this is the right topic or not.) Perform the indicated operations and simplify your answer. a) (5x - y) + (4x + 7)1 solutions Answer 209949 by richwmiller(9135)   on 2010-04-08 18:55:42 (Show Source): You can put this solution on YOUR website!No it is not the right topic because not one of your problems is an equation. One problem at a time So similar problems Limit 4 problems a day Remove the parentheses Since the second parentheses is after a plus nothing changes. 3x-y+4x+7 7x-y+7
 Length-and-distance/290063: You walk 100 yards due south, then 120 yards due west, and then 20 yards due north. How far are you from your starting point? 1 solutions Answer 209948 by richwmiller(9135)   on 2010-04-08 18:51:15 (Show Source): You can put this solution on YOUR website!You really should draw a picture of this to understand the problem. Use the top of the page as North the bottom as South, the left side as West and the right side as East ...............................A ...............................| .....................B.....C| .....................|........| .....................|___| draw a line from B to C to finish the rectangle a=BC is 120 yards b=AC 100-20=80 yards c=AB is the hypotenuse of the triangle ABC a^2+b^2=c^2 120^2+80^2=c^2 c=40sqrt(13) c=144.22 yards
 Equations/290076: This is a multi-step equation. I need the steps and the answer. What is r: 3r/4-4/5=7/10 These are all fractions. 1 solutions Answer 209944 by richwmiller(9135)   on 2010-04-08 18:35:36 (Show Source): You can put this solution on YOUR website!3r/4-4/5=7/10 multiply through by 20 5*3r-4*4=7*2 15r-16=14 Can you take it from here?
 Parallelograms/290079: how do you find the base of a parallelogram 1 solutions Answer 209943 by richwmiller(9135)   on 2010-04-08 18:33:28 (Show Source): You can put this solution on YOUR website!Depends on what info you have.
 Polynomials-and-rational-expressions/290086: y^9-y^5 or y to the ninth power minus y to the 5th power. Factor completely and check the answer by multiplication. Any help on this would be great.1 solutions Answer 209942 by richwmiller(9135)   on 2010-04-08 18:31:55 (Show Source): You can put this solution on YOUR website!y^9-y^5 perfectly written. y^9-y^5=y^5*(y^4-1) check y^5*(y^4-1)= y^9-y^5 ok
 Percentage-and-ratio-word-problems/290085: a tank contains 48 gallons of water when it is 3/4 full. how much water will it hold when it is full?1 solutions Answer 209941 by richwmiller(9135)   on 2010-04-08 18:25:05 (Show Source): You can put this solution on YOUR website!3/4*x=48 x=48*4/3 x=64
 Travel_Word_Problems/290075: A passenger jet travels from Los Angeles to Bombay, India, in 22hr. The return flight takes 17h. The difference in flight times is caused by winds over the Pacific Ocean that blows primarily west to east. If the jet's average speed in still air is 550 mi/h, what is the average speed of the wind during the round-trip flight? Round to the nearest mile per hour. Is your answer reasonable?1 solutions Answer 209935 by richwmiller(9135)   on 2010-04-08 17:34:28 (Show Source): You can put this solution on YOUR website!(550-w)*22=(550+w)*17 solve for w
 Quadratic_Equations/290074: my question is after you find the square root of the number what do u do after that?1 solutions Answer 209934 by richwmiller(9135)   on 2010-04-08 17:30:45 (Show Source): You can put this solution on YOUR website!Depends on the problem. Submit an example.
 Quadratic_Equations/290064: How do you graph these: y=-3x^2+6x+2 1 solutions Answer 209933 by richwmiller(9135)   on 2010-04-08 17:29:39 (Show Source): You can put this solution on YOUR website!The remaining equation represents a parabola that opens down. One problem at a time.
 Polynomials-and-rational-expressions/290069: 1.After completing the fencing job from two weeks ago, the company sends you to construct some fencing near a river. Your client wants you to enclose a corral adjacent to a river as in the diagram below. a. Write an equation that represents the area of the enclosure. b. if you solved for y, what would be the new equation? c. If L stands for the ength of the fence, in yards, write an equation that represents the length of fencing that you need, d. If you substituted your equation from part b into your equation in part c, then L will result in a rational function. Express L as a rational function. 2. Which quadrants, when graphed, would be appropriate to use for this problem? Justify your conclusion. 1 solutions Answer 209932 by richwmiller(9135)   on 2010-04-08 17:27:50 (Show Source): You can put this solution on YOUR website!Unfortunately, your diagram didn't appear. BTW one problem at a time.
 Linear-equations/290071: how do you find the point of intersection through an equation?1 solutions Answer 209931 by richwmiller(9135)   on 2010-04-08 17:25:03 (Show Source): You can put this solution on YOUR website!Please submit an example problem.
 Rational-functions/289911: In baseball, a player's batting average is the total number of hits divided by the total number of times at bat. A baseball player has 13 hits after 41 times at bat. How many additional consecutive times must the batter hit the ball to achieve a batting average of .440? 1 solutions Answer 209914 by richwmiller(9135)   on 2010-04-08 13:09:31 (Show Source): You can put this solution on YOUR website!(13+x)/(41+x)=.44 x=9 check (13+9)/(41+9)=.44 22/50=.44 ok
 Equations/289932: I need a rudimentary break down of 3x3 equations. I just can't figure it ot and need a step by step break down. 3x+2y+2z=2 x-2y-z=1 2x-3y-3z=-31 solutions Answer 209912 by richwmiller(9135)   on 2010-04-08 12:41:00 (Show Source): You can put this solution on YOUR website!x=0,y=-2,z=3 add #2 and #3 subtract that result from #1 you should now have just y and z in that equation multiply #2 by-2 add that to #3 you should have another with just y and z now you should be able to solve those two for y and z
 Travel_Word_Problems/289915: 2. A man leaves his house at 5.30 a.m. for a morning walk and returns at 6.15 a.m. find his displacement in this time.1 solutions Answer 209911 by richwmiller(9135)   on 2010-04-08 12:34:41 (Show Source): You can put this solution on YOUR website!He just lost 45 minutes and is home in time to hear the roosters.
 absolute-value/289922: solve and graph the folowing equations 2x/3 = 7 this is a fraction.. dont know how to solve please help1 solutions Answer 209910 by richwmiller(9135)   on 2010-04-08 12:32:23 (Show Source): You can put this solution on YOUR website!Where is the absolute value? You submitted the question in the "absolute value" category. It should be in a fraction or equation category 2x/3=7 Multiply both sides by 3 Then divide both sides by 2 Answer 10.5 Check (2*10.5)/3=7 ..........2*10.5=21 21/3=7 7=7 ok
 Square-cubic-other-roots/289975: square root of 3 * square root of 9 to the 3rd power. square root 3 times 3 inside the square root of 9 3^1/3 times 9^1/31 solutions Answer 209909 by richwmiller(9135)   on 2010-04-08 12:30:55 (Show Source): You can put this solution on YOUR website!Look through problems in this category to learn how to write your problem.
 Complex_Numbers/289920: One factor of f(x) = x^3 + x^2 - 22x - 40 is x + 4. Find the other factors.1 solutions Answer 209907 by richwmiller(9135)   on 2010-04-08 12:29:06 (Show Source): You can put this solution on YOUR website!where are the complex numbers?
 Travel_Word_Problems/289926: It takes two laser printers working together 12 minutes to complete a 580 page print job ,if each printer is printing this job alone, the first laser printer takes 10 minutes longer than the second printer . How long does it take each printer to complete the print job alone? What is the speed of each printer. I don't even know where to begin with this. Someone please help me step by step? Thanks!1 solutions Answer 209906 by richwmiller(9135)   on 2010-04-08 12:25:22 (Show Source): You can put this solution on YOUR website!Are these traveling laser printers?
 Triangles/289936: What is the height of an obtuse isosceles triangle with an area of 85 square inches and a height of 20 inches?1 solutions Answer 209905 by richwmiller(9135)   on 2010-04-08 12:20:11 (Show Source): You can put this solution on YOUR website!This a trick question to see if I was listening, right? The height is 20 inches.
 Triangles/289968: C. If the triangle has one angle that measures 35 degrees and another angle that measures 105 degrees, what is the measure of its third angle? 1 solutions Answer 209903 by richwmiller(9135)   on 2010-04-08 12:10:36 (Show Source): You can put this solution on YOUR website!the three interior angles add up to 180