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# Recent problems solved by 'ewatrrr'

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 decimal-numbers/632621: Write in decimal form (3 x 10^1) + (4 x 10^0). 1 solutions Answer 398377 by ewatrrr(10682)   on 2012-07-28 10:37:00 (Show Source): You can put this solution on YOUR website! ``` Hi, Write in decimal form (3 x 10^1) + (4 x 10^0) 30 + 4 = 34 ```
 Equations/632629: Multiply and simplify. Show your steps. square root of 15b times square root of 3b1 solutions Answer 398373 by ewatrrr(10682)   on 2012-07-28 09:55:29 (Show Source): You can put this solution on YOUR website! ``` Hi, ```
 Numbers_Word_Problems/632626: one number is 5 more than another and the difference of their squares is 30.What are the two numbers?1 solutions Answer 398371 by ewatrrr(10682)   on 2012-07-28 09:52:52 (Show Source): You can put this solution on YOUR website! ``` Hi, one number is 5 more than another Question states*** the difference of their squares is 30 y^2 - x^2 = 30 | y = (x+5) (x+5)^2 - x^2 = 30 x^2 +10x + 25 - x^2 = 30 10x = 5 x = .5, the smaller number. 5.5 the large number y. and... ```
 Square-cubic-other-roots/632492: remove grouping symbolys if necessary and simplify 4x^4-7x^3-12x^4+6x^31 solutions Answer 398319 by ewatrrr(10682)   on 2012-07-27 18:32:44 (Show Source): You can put this solution on YOUR website! ``` Hi, ```
 Probability-and-statistics/632477: If z is a standard normal variable, find the probability. The probability that z lies between -0.55 and 0.55' -0.4176 0.9000 0.4176 -0.90001 solutions Answer 398303 by ewatrrr(10682)   on 2012-07-27 17:40:48 (Show Source): You can put this solution on YOUR website! ``` Hi, P(-.55 < z < .55) = .4176 | Note: cannot have a -probability ```
 Matrices-and-determiminant/632350: Solve the following system of equations by using the inverse link to question need help on (AX=B x+6y=-16 -5x+6y=8 the inverse of matrix A, A-1 is? and what is the solution link to question here http://oi46.tinypic.com/2lji6p5.jpg1 solutions Answer 398250 by ewatrrr(10682)   on 2012-07-27 10:56:24 (Show Source): You can put this solution on YOUR website! ``` Hi, re TY, note highlighted. Please carefully follow the work, so as you may learn how to others like it. Solve the system of equations by using the inverse of the coefficient matrix. x+6y=-16 -5x+6y=8 = and... ```
 Matrices-and-determiminant/632354: Homework Question 2 need help solve the following system of equations by using the inverse of the coefficent matrix i would like if the answer was pointed out and the solution in ordered pair (AX=B) x+8y=-29 2x+3y=-19 The inverse of matrix A,A-1 is? and what is the solution in ordered pair here is a screenshot http://oi47.tinypic.com/2qwebcx.jpg just the answers i need to enter in the 4 boxes and the ordered pair please for the solution1 solutions Answer 398249 by ewatrrr(10682)   on 2012-07-27 10:44:58 (Show Source): You can put this solution on YOUR website! ``` Hi, Please carefully follow the work, so as you may learn how to others like it. Solve the system of equations by using the inverse of the coefficient matrix. x+8y=-29 2x+3y=-19 = -13 and... ```
 Polynomials-and-rational-expressions/632373: Hi , could someone plese explain how to rearrange the following equation 1/y=x-4/x make x the subject . thank you1 solutions Answer 398248 by ewatrrr(10682)   on 2012-07-27 10:29:20 (Show Source): You can put this solution on YOUR website! ``` Hi, |Multiplying thru by x so as all denominators = 1 |multiplying denominator and numerator by y ```
 Miscellaneous_Word_Problems/632368: Mark had 3 times more marbles than Isabella. Isabella had 2/3 as many marbles as Jack for a total of 99 marbles. How many marbles did Mark, Isabella, and Jack each have? Write an algebraic equation that represents the problem stated above, being sure to define your variable, and use the algebraic equation to solve the problem. Show your work1 solutions Answer 398246 by ewatrrr(10682)   on 2012-07-27 10:19:42 (Show Source): You can put this solution on YOUR website! ``` Hi, Mark had 3 times more marbles than Isabella. Isabella had 2/3 as many marbles as Jack's marbles Jack Isabella Mark 2x x = 27, number Jack has. Isabelle has 18 and Mark 54 and... ```
 Probability-and-statistics/632369: What topic in statistics does the term "half-life" fall? 1 solutions Answer 398245 by ewatrrr(10682)   on 2012-07-27 10:14:56 (Show Source): You can put this solution on YOUR website! ``` Hi, half life problems on this site are found under: Algebra: Exponent and logarithm as functions of power As Decay is generally describe using: fnding the value of k = ln2/(half life) and using that value into the general EQ to find Q(t) ```
 Numbers_Word_Problems/632363: my hundreds digit is 2 more than my ones digit and my tens dgit is 1 less than my hundred digit,what numbers can i be? 1 solutions Answer 398243 by ewatrrr(10682)   on 2012-07-27 09:49:26 (Show Source): You can put this solution on YOUR website! ``` Hi, my hundreds digit is 2 more than my ones digit and my tens dgit is 1 less than my hundreds digit results all depend on what the ones digit is.... 210, 321, 432, 543, 654, 765, 876, 987 ```
 Functions/632367: f(x) = x-8/x-7 find the domain of the rational function 1 solutions Answer 398241 by ewatrrr(10682)   on 2012-07-27 09:43:47 (Show Source): You can put this solution on YOUR website! ``` Hi, If You meant |Note; Cannot divide by ZERO Domain (allowable x-values) is all real numbers such that x ≠ 7 ```
 Equations/632360: x +2/3x+3(x) =991 solutions Answer 398240 by ewatrrr(10682)   on 2012-07-27 09:41:02 (Show Source): You can put this solution on YOUR website! ``` Hi, rounded to the nearest tenth ```
 Proportions/632362: It takes Kurt twice as long to earn \$60 as it takes Paul to earn \$40.What is the ratio of Kurt's pay per hour to Paul's pay per hour?1 solutions Answer 398238 by ewatrrr(10682)   on 2012-07-27 09:35:01 (Show Source): You can put this solution on YOUR website! ``` Hi, takes Kurt twice as long to earn \$60 as it takes Paul to earn \$40 Let x represent Paul's time Question states*** Kurt: or Paul: or ratio of Kurt's pay per hour to Paul's pay per hour ```
 Travel_Word_Problems/632364: Sandy and Kelvin live 385 miles apart. They each leave home at 3:00 P.M. Sandy drives 60 mph, and Kelvin drives 50 mph. At what time will they meet? 1 solutions Answer 398235 by ewatrrr(10682)   on 2012-07-27 09:22:34 (Show Source): You can put this solution on YOUR website! ``` Hi, Question states*** They each drive the same amount of time: t = D/r Let x represent the amount of distance driven by Kelvin | Cross Multiplying to solve 60x = 50(385-x) 110x = 19250 x = 175, distance driven by Kelvin. t = 175/50 =3.5 hrs left home at 3:00 P.M. met at 6:30 P.M. and(just checking...) Sandy's time = 210/60 = 3.5 hrs ```
 Money_Word_Problems/632356: If 3,000 dollars is left in an account for 4 years and the earned interest is 84. dollars, then how much interest would be earned in 7 years.1 solutions Answer 398232 by ewatrrr(10682)   on 2012-07-27 09:13:24 (Show Source): You can put this solution on YOUR website! ``` Hi If 3,000 dollars is left in an account for 4 years, the earned interest is \$84 or \$84/4 = \$21 per year In 7 years: 7*\$21 = \$147 in interest would be earned ```
 Matrices-and-determiminant/632358: Solve the Following System of equations by using the inverse of the coefficent (AX=B) x+5y=25 5x+5y=45 The Inverse of matrix A, A-1 is? and what is the solution in ordered pair please just post the answers i need in the box and the soultion for the system here is screenshot of question http://oi47.tinypic.com/2cpx6l0.jpg1 solutions Answer 398230 by ewatrrr(10682)   on 2012-07-27 08:59:32 (Show Source): You can put this solution on YOUR website! ``` Hi, Solve the system of equations by using the inverse of the coefficient matrix. x+5y = 25 5x+5y = 45 = -20 and... Checking our answer using the Elimination Method: x+5y = 25 5x+5y = 45 |Subtracting 1st EQ from the 2nd 4x = 20 x = 5 and y = 4 as (x,y) Ordered pair (5,4) the solution for this system of equations ```
 decimal-numbers/632184: what is the solution set for x^2- 12x=-5 1 solutions Answer 398094 by ewatrrr(10682)   on 2012-07-26 16:32:15 (Show Source): You can put this solution on YOUR website! ``` Hi, Previously Posted x^2- 12x = -5 x^2 - 12x + 5 = 0 x = 11.57 or x = .43 rounded to the nearest hundredth ```
 decimal-numbers/632185: what is the solution set for x^2- 12x=-5 rounded to the nearest hundredths 1 solutions Answer 398093 by ewatrrr(10682)   on 2012-07-26 16:31:19 (Show Source): You can put this solution on YOUR website! ``` Hi, x^2- 12x = -5 x^2 - 12x + 5 = 0 x = 11.57 or x = .43 rounded to the nearest hundredth ```
 Linear-systems/632158: Solve the system of equations by the Gaussian elimination method. (If the system is dependent, enter a general solution in terms of c1, c2, ... 3x − 5y + 2z = 2 x − 3y + 2z = 2 5x − 11y + 6z = 61 solutions Answer 398089 by ewatrrr(10682)   on 2012-07-26 16:09:31 (Show Source): You can put this solution on YOUR website! ``` Hi, 3x − 5y + 2z = 2 x − 3y + 2z = 2 5x − 11y + 6z = 6 Dependent system as D =0, as well as Dx=0, Dy= 0 and Dz = 0 or as demonstated by selecting different pairs of EQs and eliminating z for both: 2x - 2y = 0 2x - 2y = 0 |Subtracting 2nd from 1st 0 = 0 Dependent System Dependent relationship in terms of z: (z-1, z-1, z) x = z - 1 |Eliminating y-variable using a pair of EQs y = z - 1 |Eliminating x-variable using a pair of EQs ```
 Linear-systems/632161: I cannot figure out how to solve systems by graphing. I have read and read but am so confused. I need to solve the system 2x+y=2; 6x+4y=12. Please help me figure out the answer and show/explain how. Thanks.1 solutions Answer 398065 by ewatrrr(10682)   on 2012-07-26 14:53:14 (Show Source): You can put this solution on YOUR website! ``` Hi, Solve the system by putting each of their graphs on the same graph the point they intersect at: (-2,6) is the solution for this system If You are having difficulty graphing each of the linear equations: find at least 2 (x,y)points for each and connect pair of the 2 points with their respective line 2x+y=2 x = 0 ⇒ y = 2, y = 0 ⇒ x = 1 (0,2) and (1,0) on this line 6x+4y=12 x = 0 ⇒ y= 3, y = 0 ⇒ x = 2 (0,3) and (2,0) on this line ```
 Travel_Word_Problems/632049: A train travels 45km in an hour.How many metres is that in one minute? 1 solutions Answer 398042 by ewatrrr(10682)   on 2012-07-26 13:22:41 (Show Source): You can put this solution on YOUR website! ``` Hi, ```
 Finance/632140: A manufacturer pays its assembly line workers \$11.14 per hour. In addition, workers receive a piece work rate of \$1.24 per unit produced. Write a linear equation for the hourly wages in terms of the number of units produced per hour.1 solutions Answer 398039 by ewatrrr(10682)   on 2012-07-26 13:07:36 (Show Source): You can put this solution on YOUR website! ``` Hi, A manufacturer pays its assembly line workers \$11.14 per hour. In addition, workers receive a piece work rate of \$1.24 per unit produced. where x is number of units produced per hour ```
 Money_Word_Problems/632132: Tina sells purses in a department store. She earns a weekly salary of \$225 plus a commission of 3.5% on all her sales. Last week her sales were \$3,595. How much did she earn?1 solutions Answer 398037 by ewatrrr(10682)   on 2012-07-26 12:57:55 (Show Source): You can put this solution on YOUR website! ``` Hi, She earns a weekly salary of \$225 plus a commission of 3.5% on all her sales. \$3595 in sales ⇒ she earns: \$225 + .035*\$3595 = \$225 + \$125.83 = \$350.83 ```
 Linear-equations/632142: Find the slope of the line that passes through the pair of points (-3,5),(-4,5)1 solutions Answer 398035 by ewatrrr(10682)   on 2012-07-26 12:52:56 (Show Source): You can put this solution on YOUR website! ``` Hi, Find the slope of the line that passes through the pair of points (-3,5), (-4,5) m = 0/1 = 0 m = 0 , this is a horizontal line, y = 5 ```
 Numeric_Fractions/632143: Why is 3&3/4-2&1/2 =1&1/2? 1 solutions Answer 398034 by ewatrrr(10682)   on 2012-07-26 12:48:48 (Show Source): You can put this solution on YOUR website! ``` Hi, Why is ```
 Linear-equations/632134: x+y+z=11 2x+3y++2z=27 x+2y+2z=19 Please show work solving the systems of equations1 solutions Answer 398033 by ewatrrr(10682)   on 2012-07-26 12:45:51 (Show Source): You can put this solution on YOUR website! ``` Hi, x+y+z=11 2x+3y++2z=27 x+2y+2z=19 D = 1, Dx = 3, Dy = 5, Dz = 3 , , ```
 Equations/632138: 8(3x-4)=4(6x+7)1 solutions Answer 398030 by ewatrrr(10682)   on 2012-07-26 12:37:23 (Show Source): You can put this solution on YOUR website! ``` Hi, 8(3x-4)=4(6x+7) 24x - 32 = 24x + 28 -32 ≠ 28, there is NO solution ```
 Mixture_Word_Problems/632129: A dealer wishes to produce 300 gallons of oil worth 40 a quart. He has oil worth 36 a quart and oil worth 52 a quart. How many quarts of each should he mix?1 solutions Answer 398029 by ewatrrr(10682)   on 2012-07-26 12:33:08 (Show Source): You can put this solution on YOUR website! ``` Hi has oil worth 36 a quart and oil worth 52 a quart Let x represent number of quarts woth 52 a quart Question states**wishes to produce 300 gallons( 4qts/gal) of oil worth 40 a quart* Money = Money 52x + 36(1200 - x) = 40(1200) 16x = 4800 x = 300 qts at 52 and 900 qts at 36 and ```
 Equations/632131: Mark had 3 times more marbles than Isabella. Isabella had 2/3 as many marbles as Jack. How many marbles did Mark, Isabella, and Jack have? Write algebraic equation and solve.1 solutions Answer 398025 by ewatrrr(10682)   on 2012-07-26 12:09:53 (Show Source): You can put this solution on YOUR website! ``` Hi, Mark had 3 times more marbles than Isabella. Isabella had 2/3 as many marbles as Jack's marbles Jack 3 Isabella 2 Mark 2x 6 Jack needs to have at least 3 marbles or a multiple of 11 is the number of marbles there could have been. ```
 Numbers_Word_Problems/632114: Find two consecutive even integers whose product is 72. Find two consecutive even integers whose product is 168.1 solutions Answer 398020 by ewatrrr(10682)   on 2012-07-26 11:57:23 (Show Source): You can put this solution on YOUR website! ``` Hi, Find two consecutive integers, whose product is 72. x(x+1) = 72 x^2 + x - 72 = 0 (x+9)(x-8) = 0 , x = -9 or x = 8 two consecutive integers are: -9, -8 or 8, 9 There are no two consecutive even integers whose product is 72 Find two consecutive even integers , whose product is 168. x(x+2) = 168 x^2 + 2x - 168 = 0 (x+14)(x-12) = 0. x = -14 or x = 12 two consecutive even integers are: -14, -12 or 12, 14 ```