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# Recent problems solved by 'ewatrrr'

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 Rational-functions/666686: Find the horizontal asymtope of the given function... F(x)= 4x^2+9/4x^2-91 solutions Answer 414614 by ewatrrr(10682)   on 2012-10-15 12:35:52 (Show Source): You can put this solution on YOUR website! ``` Hi, horizontal asymtope: y = 1 ```
 Linear-equations/666683: Solve the system by substitution. 2x-y+z=-4 z=5 -2x+3y-z=-10 answers: A). (-8,7,5) B). (-8,-7,5) C). (8,-7,5) D). (-8,-7,-5)1 solutions Answer 414613 by ewatrrr(10682)   on 2012-10-15 12:30:09 (Show Source): You can put this solution on YOUR website! ``` Hi, 2x-y+z=-4 || z=5 -2x+3y-z=-10 || z=5 2x - y = -9 -2x + 3y = -5 || Adding to eliminate x 2y = -14 y = -7 and x = -8 ```
 Linear_Equations_And_Systems_Word_Problems/666677: How many quarts of pure alcohol must be added to 10 quarts of a 15% alcohol solution to obtain a mixture which is 25% alcohol? All percentage are by volume. please help me.....1 solutions Answer 414611 by ewatrrr(10682)   on 2012-10-15 12:23:07 (Show Source): You can put this solution on YOUR website! ``` Hi, How many quarts of pure alcohol must be added to 10 quarts of a 15% alcohol solution to obtain a mixture which is 25% alcohol? Translatethe 'Mixing' into an equation***expressing ALL in terms of alcohol || Solve for x .75x = .10·10 x = 1.3 qt ```
 Graphs/666612: y=3x+2 y=-4x+2 why does my professor show me so many steps--its confusing unles im incorrect, i know the y int is 2 and the slope is three-we did this on the board in class as a whole but I want to see it done in a much more simpler fashion:) Thanks! 1 solutions Answer 414609 by ewatrrr(10682)   on 2012-10-15 12:17:30 (Show Source): You can put this solution on YOUR website! ``` Hi, Using the standard slope-intercept form for an equation of a line y = mx + b where m is the slope and b the y-intercept. Doesn't get simpler than that: y = 3x+2 Yes. m = 3 and the y=intercept is 2 Green y= -4x+2 m = -4 and the y=intercept is 2 Blue ```
 Miscellaneous_Word_Problems/666663: In a survey of 100 students, the numbers taking various courses were found to be as follows. English: 60 Math: 40 Chemistry: 50 English/Math:30 English/Chem:35 Math/Chem:35 All three courses: 25 A) how many students were taking math but neither English nor chemistry B)how many were taking math and chemistry but not English C) how many were taking English and chemistry but not math1 solutions Answer 414608 by ewatrrr(10682)   on 2012-10-15 12:10:15 (Show Source): You can put this solution on YOUR website! ``` Hi, A) how many students were taking math but neither English nor chemistry NONE B)how many were taking math and chemistry but not English 10 C) how many were taking English and chemistry but not math 10 ```
 Numeric_Fractions/666635: My questions are not all numeric. Here goes how do you simplify questions like 4 1\8 divided 1 1\2? I need the step by step process.how do you put a list of numbers together from least to greatest when u have negatives decimals and fractions. If there is a site i can go to or certain books i can get please tell me. Thank you for your time.1 solutions Answer 414606 by ewatrrr(10682)   on 2012-10-15 11:56:39 (Show Source): You can put this solution on YOUR website! ``` Hi, As to least to greatest when u have negatives decimals and fractions: Might recommend this Number Line Site (Numbers least to greatest read from left to right) number line ```
 Percentage-and-ratio-word-problems/666649: In a class of 32 are 22 boys what is the percentage ?1 solutions Answer 414604 by ewatrrr(10682)   on 2012-10-15 11:26:41 (Show Source): You can put this solution on YOUR website! ``` Hi, In a class of 32 are 22 boys what is the percentage ? = 68.75% ```
 test/666624: On checking with 100 families, it was found that 83 subscribe to time, 55 to Newsweek, and 10 to neither. How many subscribe to both?1 solutions Answer 414602 by ewatrrr(10682)   on 2012-10-15 11:24:16 (Show Source): You can put this solution on YOUR website! ``` Hi, Re TY: have You posted Your 2 other? On checking with 100 families, it was found that 83 subscribe to time, 55 to Newsweek, and 10 to neither. How many subscribe to both? 100- 10 = 90. 83+55 - 90 = 48 to both ```
 Mixture_Word_Problems/666644: How many liters of a 14 percent Alcohol Solution must be mixed with 20 liters of a 50 percent Alcohol solution to get a 20 percent alchohol solution. 1 solutions Answer 414601 by ewatrrr(10682)   on 2012-10-15 11:17:08 (Show Source): You can put this solution on YOUR website! ``` Hi, How many liters of a 14 percent Alcohol Solution must be mixed with 20 liters of a 50 percent Alcohol solution to get a 20 percent alchohol solution. Translate into an equation: ||| Solve for x ```
 Linear-systems/666643: What is the solutions of x and y for the equations x+y=1 and 2x-y=-2? 1 solutions Answer 414599 by ewatrrr(10682)   on 2012-10-15 11:12:57 (Show Source): You can put this solution on YOUR website! ``` Hi, What is the solutions of x and y for the equations x+y=1 2x-y=-2 ||Adding to eliminating y 3x = -1 x = -1/3 and y = 4/3 ```
 Linear-equations/666632: Solve the system by elimination. x+5y-4z=-10 2x-y+5z=-9 2x-10y-5z=0 answers: A). (5,-1,0) B). (-5,1,0) C). (-5,-1,0) D). (-5,-1,-2)1 solutions Answer 414598 by ewatrrr(10682)   on 2012-10-15 11:10:07 (Show Source): You can put this solution on YOUR website! ``` Hi, x+5y-4z=-10 2x-y+5z=-9 ||eliminating z 13x + 21 y = -86 2x-y+5z=-9 2x-10y-5z=0 ||eliminating z 4x - 11y = -9 13x + 21 y = -86 21x = -105, x = -5 and y = -1 and z = 0 ```
 Functions/666613: 8- Show work, find the average rate of change of f(x)= -3x²+4 a- From -2 to 0 b- From 3 to 5 c- From -2 to 1 1 solutions Answer 414591 by ewatrrr(10682)   on 2012-10-15 10:51:56 (Show Source): You can put this solution on YOUR website! ``` Hi, find the average rate of change of f(x)= -3x^2 + 4 a- From -2 to 0 b- From 3 to 5 c- From -2 to 1 ```
 Functions/666615: 10- Show work, find the function that is finally graphed after the following transformations are applied to the graph of y=√x in order listed. 1- Reflected about the x-axis (flipped) 2- Shift up 7 units 3- Shift left 4 units Y= 1 solutions Answer 414586 by ewatrrr(10682)   on 2012-10-15 10:41:56 (Show Source): You can put this solution on YOUR website! ``` Hi, y=√x Green 1- Reflected about the x-axis (flipped) 2- Shift up 7 units 3- Shift left 4 units y = Blue ```
 Functions/666619: 11- Show work, for the function f(x)=x³+x, find the average rate of change of f from 1 to x: a- x³+x+2 x-1 b- x²+x+2 c- x²+2 d- 1 1 solutions Answer 414582 by ewatrrr(10682)   on 2012-10-15 10:37:11 (Show Source): You can put this solution on YOUR website! ``` Hi, f(x)=x³+x, find the average rate of change of f from 1 to x: f(x) - f(1)/(x-1) = Note:x^3 + x - 2 , x = 1 a root 0r (x-1) a factor using Synthetic Divsion 1 1 0 1 -2 1 1 2 1 1 2 0 generates the factor x^2 + x + 2 ```
 Polynomials-and-rational-expressions/666187: What is 54x^4-54x^3+30x^2 divided by 6x?1 solutions Answer 414326 by ewatrrr(10682)   on 2012-10-14 15:33:53 (Show Source): You can put this solution on YOUR website! ``` Hi, ```
 Equations/666169: 8 3/4 - 3 1/4 please explain 7 5/12 -2 3/4 please explain1 solutions Answer 414325 by ewatrrr(10682)   on 2012-10-14 15:31:20 (Show Source): You can put this solution on YOUR website! ``` Hi, With fraction subtractions, it is the same as with whole number subtraction... sometimes You have to 'borrow' ... No need to borrow on this one Borrowing '1' from the 7 is the same as Borrowing and ```
 Exponential-and-logarithmic-functions/666136: 1. Find the peaks and the troughs (= interior local maxima and minima) of the function y = x^3 - 10.5x^2 + 30x +201 solutions Answer 414301 by ewatrrr(10682)   on 2012-10-14 14:12:57 (Show Source): You can put this solution on YOUR website! ``` Hi, y = x^3 - 10.5x^2 + 30x +20 y' = 3x^2 - 21x + 30 When Slope = 0, maxima and minina pts are achieved at x. 3x^2 - 21x + 30 = 0 x^2 - 7x + 10 = 0 (x-2)(x-5) = 0 x = 2 or x = 5 f(2) = 46 maxima f(5) = 32.5 minima ```
 Equations/666138: Use the distributive property to rewrite the expression. (c+3)21 solutions Answer 414295 by ewatrrr(10682)   on 2012-10-14 14:00:37 (Show Source): You can put this solution on YOUR website! ``` Hi, Use the distributive property to rewrite the expression. (c+3)2 = ```
 Expressions-with-variables/666134: the problem is y=2x+9 y=7x+8 i subtracted 2x from the first equation to get y-2x=9 and subtracted 7x from the second to get y-7x=8 i then used substitution method to get 7(2x-y)-y=8 to get 14x-7y-y=8, but i dont know if that is correct to get to the final steps.? 1 solutions Answer 414292 by ewatrrr(10682)   on 2012-10-14 13:51:38 (Show Source): You can put this solution on YOUR website! ``` Hi, y=2x+9 y=7x+8 2x+9 = 7x+8 1 = 5x 1/5 = x and ```
 t e s t/666049: Find the derivative of the following functions. Note that you need to use the Chain Rule or Product Rule where applicable. Note the following for question (where applicable): • d/dx[ln(x)] = 1/x • d/dx [eax] = aeax, where a is constant not equal to 0. • d/dx[bx] = ln(b)*bx, where b is the base of the exponential F(x) = (x-1)^2(2x+3)^31 solutions Answer 414290 by ewatrrr(10682)   on 2012-10-14 13:49:15 (Show Source): You can put this solution on YOUR website! ``` Hi, F(x) = (x-1)^2(2x+3)^3 F'(x) = Will Let You finish Up ```
 Linear-systems/666129: I've tried to work out these coordinate pairs questions but am so stuck -I just need help with the first one to know how to proceed-please help me- Question: Complete these coordinate pairs so they satisfy the given rule A) y=x+7 (0, )(1, ),(2, ),(3, ),(4, ) -Thanks LK1 solutions Answer 414285 by ewatrrr(10682)   on 2012-10-14 13:36:41 (Show Source): You can put this solution on YOUR website! ``` Hi, Re TY: just substitute the x-value given into the EQ y = (x+1)to find the y-value... y = x+7 (1,_) x = 1, y = 8, Point is (1,8) y = x+7 ||Note (0,_) represents an ordered pair (x,y) Question is asking "What is y when x = 0 " y = 0 + 7 y = 7 , Ordered pair (x,y) is (0,7) ```
 expressions/666123: 1/3a+2=2/3a 1 solutions Answer 414281 by ewatrrr(10682)   on 2012-10-14 13:32:54 (Show Source): You can put this solution on YOUR website! ``` Hi, is this what You meant IF so... 6 = a ```
 Trigonometry-basics/666118: Find the values of x that will make 4x/3x^2+x undefined i know u set the bottom to zero and get 4x over 3x^2+x=0 but then im not shure what to do 1 solutions Answer 414273 by ewatrrr(10682)   on 2012-10-14 13:02:29 (Show Source): You can put this solution on YOUR website! ``` Hi, Re TY, Yes, you certainly had the right idea! Yes. Consider when the denominator is zero 3x^2 + x = 0 x(3x+ 1) = 0 x = 0 Or (3x+ 1) = 0 x = 0 Or x = -1/3 makes the denominator zero and make 4x/3x^2+x undefined ```
 Trigonometry-basics/666109: 3X^2-13X+14/4X * 12X^2/X^3-2X^2 / 9X-21/6 i know you keep change flip to get 3X^2-13X+14/4X * 12X^2/X^3-2X^2 * 6/9X-21 then u factor (which this is probably where i went wrong) and get (3X-6)(3X-7)/4X * 12X^2/X^2(X-2) * 6/3(3X-7) then u are suposed to reduce any from top to bottom but all i can get rid of are the (3X-7)s but then i still have a ton on the tops and bottomes so im not shure where to go from here with multiplying the tops and bottomes so if someone could help it would be much apreshiated thanks1 solutions Answer 414271 by ewatrrr(10682)   on 2012-10-14 12:58:12 (Show Source): You can put this solution on YOUR website! ``` Hi, Take a look and finish Up ```
 Polynomials-and-rational-expressions/666110: x/x+1 - 3x-5/x^2+10x+91 solutions Answer 414269 by ewatrrr(10682)   on 2012-10-14 12:44:47 (Show Source): You can put this solution on YOUR website! ``` Hi, ```
 Trigonometry-basics/666103: Can you do this for me: http://education.fcps.org/uhs//sites/default/files/cindy.miller/LTA%206.pdf Please do 1,2,3,4,5. Thanks!1 solutions Answer 414266 by ewatrrr(10682)   on 2012-10-14 12:38:15 (Show Source): You can put this solution on YOUR website!See following: www.mathsisfun.com/algebra/trig-solving-triangles.html
 Rate-of-work-word-problems/666104: A painter can paint a certain house in 12 hours by herself but it takes her helper 15 hours to do the same job himself. the painter starts the job alone but her helper her 5 hours later. How long will it take the two of them together to finish painting the house?1 solutions Answer 414260 by ewatrrr(10682)   on 2012-10-14 12:27:30 (Show Source): You can put this solution on YOUR website! ``` Hi, A painter can paint a certain house in 12 hours by herself: In 5hrs done. of the house remaining to complete helper 15 hours to do the same job himself: = 9/60 of the house per hour together = 35/9 hr remaining time together ```
 Exponents/666098: can u help understand how TO do express phrase algebraic expression eight divided into a number y 1 solutions Answer 414259 by ewatrrr(10682)   on 2012-10-14 12:18:39 (Show Source): You can put this solution on YOUR website! ``` Hi, eight divided into a number y Same as: y divided by 8 ```
 percentage/666092: How do you figure out 74%of 38?1 solutions Answer 414252 by ewatrrr(10682)   on 2012-10-14 11:53:50 (Show Source): You can put this solution on YOUR website! ``` Hi, 74% 'of' 38 is ```
 Rate-of-work-word-problems/666084: Math word probelm: Andy can paint a room in 4 hours, Betty in 6 hours and Chuck in 8 hours. If Betty and Chuck work together for 1 hour and then Andy joins them and they all work together until the room is finished, how long did Andy work?1 solutions Answer 414250 by ewatrrr(10682)   on 2012-10-14 11:51:03 (Show Source): You can put this solution on YOUR website! ``` Hi, Re TY. Thank You for calling attention to the typo. Andy can paint a room in 4 hours, Betty in 6 hours and Chuck in 8 hours. Betty and Chuck work together for 1 hour 0r did = 7/24 of the room 17/24 left: together do 13/24 of room per hour = 1.3 hours Andy worked (rounded to the nearest tenth) ```
 Human-and-algebraic-language/666058: One number is 3 less than a second number. Twice the second number is 5 less than 3 times the first. Find the two numbers.1 solutions Answer 414247 by ewatrrr(10682)   on 2012-10-14 11:37:45 (Show Source): You can put this solution on YOUR website! ``` Hi, Previously Posted One number is 3 less than a second number Twice the second number is 5 less than 3 times the first. Translating 2nd statement into an equation: 2x = 3y - 5 ||| From 1st statement 2x = 3(x-3) - 5 2x = 3x - 9 - 5 14 = x and y = 11 and... ```