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# Recent problems solved by 'ewatrrr'

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 Linear-equations/673360: y-3=-3/2(x+1) need to know how to multiply -3/2(x+1)1 solutions Answer 418613 by ewatrrr(10682)   on 2012-10-29 15:37:25 (Show Source): You can put this solution on YOUR website! ``` Hi, ```
 Permutations/673361: How many ways can a committee of 3 people be selected from 18 people?1 solutions Answer 418612 by ewatrrr(10682)   on 2012-10-29 15:34:22 (Show Source): You can put this solution on YOUR website! ``` Hi, How many ways can a committee of 3 people be selected from 18 people? 18C3 ways ```
 Equations/673354: Solve x²+(x+2)²=34 All I have so far is x²+(x+2)²-34=0 1 solutions Answer 418611 by ewatrrr(10682)   on 2012-10-29 15:33:36 (Show Source): You can put this solution on YOUR website! ``` Hi, x²+(x+2)²-34=0 || Good start! ||expanding 2x^2 + 4x - 30 = 0 (2x -6)(x+5) = 0 x = 3 0r x = -5 ```
 Rational-functions/673355: 4^2x-1 = the square root of 2 4^2x-1 = 2^1/2 2x-1 = 1/2 2x = 1/2 + 1 x = 3/2 divided by 2 x = 3/2 * 1/2 x = 3/4 But this answer doesn't work in the equation. Can you please help me?1 solutions Answer 418606 by ewatrrr(10682)   on 2012-10-29 15:28:46 (Show Source): You can put this solution on YOUR website! ``` Hi, 4^(2x-1) = 2^1/2 **2^2(2x-1) = 2^1/2 2(2x-1) = 1/2 4x - 2 = 1/2 4x = 5/2 x = 5/8 ```
 Functions/673312: Need help with the following function: (fof)(x) when f(x)= x/x+1. I know the answer is x/2x+1 but cant figure out how to get there. Thanks!! 1 solutions Answer 418591 by ewatrrr(10682)   on 2012-10-29 14:11:40 (Show Source): You can put this solution on YOUR website! ``` Hi, = Note: the Denominator ```
 Linear_Equations_And_Systems_Word_Problems/673310: A does 4/5 of a work in 20 days.He then calls in B and together finish the remaining work in 3 days. how long B would take to do the whole work? 1 solutions Answer 418588 by ewatrrr(10682)   on 2012-10-29 14:05:27 (Show Source): You can put this solution on YOUR website! ``` Hi, A does 4/5 of a work in 20 days. 1/25 per day In 3 days then 3/25 of work: 1/5 - 3/25 = 2/25 left for B to do in 3 days B can do 2/75 of the total work in one day. 37 1/2 days to do the whole work ```
 Probability-and-statistics/673307: you reach into a bag of coins and withdrew two coins. what is the probablility you withdrew a nickle and then a dime if the bag held ten pennies six nickles and five dimes?1 solutions Answer 418582 by ewatrrr(10682)   on 2012-10-29 13:48:00 (Show Source): You can put this solution on YOUR website! ``` Hi, bag with coins: ten pennies, six nickles and five dimes withdraw 2 coins.. P(nickle then dime) = ```
 Numeric_Fractions/673308: Both sixth grade classes have to each cover 35 math books. Each book cover is made from 1/8 yards of fabric. There is 8 1/2 yards of fabric. Is there enough fabric for both classes? A Yes, there is exactly enough fabric to cover the books. B No, there is enough fabric to cover 64 books. C No, there is enough fabric to cover 68 books. D No, there is enough fabric to cover 66 books.1 solutions Answer 418580 by ewatrrr(10682)   on 2012-10-29 13:45:33 (Show Source): You can put this solution on YOUR website! ``` Hi, Each book cover is made from 1/8 yards of fabric. There is 8 1/2 yards of fabric 0r 17/2 yards 0r 68/8 yards ```
 Expressions-with-variables/673306: Evaluate the following expressions for the given set of scores: a)Ex b)Ex^2 c)(Ex)^2 d)E2x e)E(x-2) Scores: x -- 0 5 3 2 Thanks for your help. 1 solutions Answer 418579 by ewatrrr(10682)   on 2012-10-29 13:42:46 (Show Source): You can put this solution on YOUR website! ``` Hi, HIGHLY recommend setting something like this Up in an Excel worksheet x x^2 2x x-2 0 0 0 -2 5 25 10 3 3 9 6 1 2 4 4 0 sum 10 38 20 2 sum^2 100 ```
 Quadratic_Equations/673297: What is the vertex form of the equation? y = x^2 + 4x – 3 1 solutions Answer 418578 by ewatrrr(10682)   on 2012-10-29 13:28:18 (Show Source): You can put this solution on YOUR website! ``` Hi, What is the vertex form of the equation? y = x^2 + 4x – 3 y = x^2 + 4x +4 -4 – 3 y=(x+2)^2 - 7 Vertex form: V(-2,-7) ```
 Problems-with-consecutive-odd-even-integers/673303: find 3 consecutive odd integers such that 3 times the smallest is 5 more than 2 times the largest1 solutions Answer 418577 by ewatrrr(10682)   on 2012-10-29 13:23:55 (Show Source): You can put this solution on YOUR website! ``` Hi, find 3 consecutive odd integers such that 3 times the smallest is 5 more than 2 times the largest 3x = 2(x+4) + 5 x = 13 consecutive odd integers are: 13, 15, 17 and... 39 = 34 + 5 ```
 �t�e�s�t/673295: Which expression is equivalent to -2h - (5 - 3h)? A. h B. -4h C. h - 5 D. -5h - 5 1 solutions Answer 418576 by ewatrrr(10682)   on 2012-10-29 13:21:11 (Show Source): You can put this solution on YOUR website! ``` Hi, -2h - (5 - 3h) = -2h - 5 + 3h = h-5 ```
 Linear-equations/673042: The perimeter of a rectangle is 38ft. The length is 1ft longer than the width. find the deminsions. Write a linear equations and solve the resulting sytem. Let x be the length ans y be the width first equation 2x+2y= write the second equation x= y+ what is the length what is the width1 solutions Answer 418574 by ewatrrr(10682)   on 2012-10-29 13:05:25 (Show Source): You can put this solution on YOUR website! ``` Hi, The perimeter of a rectangle is 38ft. The length is 1ft longer than the width. 2x + 2y = 38ft x + y = 19ft (y + 1) + y = 19 2y = 18 y = 9ft, the length. The width x is 10ft ```
 Linear-equations/673278: write an equation in slope intercept (-3,7) and (2,3)1 solutions Answer 418572 by ewatrrr(10682)   on 2012-10-29 12:59:04 (Show Source): You can put this solution on YOUR website! ``` Hi, write and equation in slope intercept form for the line passing through points (-3,7) and ( 2,3) y = mx + b y = (-4/5)x + b ||Using the (x,y) ordered pair (2,3) to solve for b 23/5 = b y = (-4/5)x + 23/5 ```
 Linear-equations/673282: write and equation in slope intercept form for the line passing through points (2,2) & (0,1)1 solutions Answer 418571 by ewatrrr(10682)   on 2012-10-29 12:55:38 (Show Source): You can put this solution on YOUR website! ``` Hi, write and equation in slope intercept form for the line passing through points (2,2) & (0,1) m = (2-1)/(2-0) = 1/2 y = mx + b y = (1/2)x + b ||Using the (x,y) ordered pair (0,1) to solve for b 1 = b y = (1/2)x + 1 ```
 Linear-equations/673287: find slope for line passing through points (2,4) & (3,2)1 solutions Answer 418570 by ewatrrr(10682)   on 2012-10-29 12:52:08 (Show Source): You can put this solution on YOUR website! ``` Hi, find the slope for the line passing through (x,y) ordered pairs: points (2,4) & (3,2) ```
 Linear-equations/673283: find the slope for the line passing through points (-2,1)&(-3,4)1 solutions Answer 418569 by ewatrrr(10682)   on 2012-10-29 12:50:43 (Show Source): You can put this solution on YOUR website! ``` Hi, find the slope for the line passing through (x,y) ordered pairs: points (-2,1)& (-3,4) ```
 Sequences-and-series/673220: The second and fifth terms of a geometric series are -15 and 405 respectively. What are the first term and the common ratio in the series? What is the sum of the first 9 terms of the series?1 solutions Answer 418568 by ewatrrr(10682)   on 2012-10-29 12:47:18 (Show Source): You can put this solution on YOUR website! ``` Hi, The second and fifth terms of a geometric series are -15 and 405 respectively. r = ⇒ and r = -3 = 24605 ```
 Pythagorean-theorem/673266: The distance between the points (7, 3) and (9, 3) is how many units? PLEASE SHOW ME HOW YOU GET THE ANSWER!!1 solutions Answer 418567 by ewatrrr(10682)   on 2012-10-29 12:31:54 (Show Source): You can put this solution on YOUR website! ``` Hi, (x,y) ordered pairs:points (7, 3) and (9, 3) D = ```
 �t�e�s�t/673224: Please what I am so confused on the following question: If I have data points for the boiling point of water ELEVATION (ft): 0, 1000, 2000, 3000, 4000, 5000 BOILING POINT(F): 212, 210.2, 208.4, 206.6, 204.8, 203 Question: Using the equation y= -0.002x + 212 (which is a rounded version of the equation line of best fit for this data) At what elevation would you expect for water to boil at 207 degrees Fahrenheit? Round answer nearest foot and explain your answer. HOW DO I EXPLAIN my answer in a sophisticated way??? PLEASE PLEASE help me I would really appreciate it and thank you for your time.1 solutions Answer 418566 by ewatrrr(10682)   on 2012-10-29 12:28:55 (Show Source): You can put this solution on YOUR website! ``` Hi, y= -0.002x + 212°F 207°F = -.002x + 212°F Boling point of water decreases as elevations increase. ```
 Linear-equations/673261: Which of the following points is 5 units away from the point (3, 6)? A (3, 12) B (–1, 6) C (–8, 6) D (3, –1) E (8, 6) 1 solutions Answer 418562 by ewatrrr(10682)   on 2012-10-29 12:13:09 (Show Source): You can put this solution on YOUR website! ``` Hi, Which of the following points is 5 units away from the point (3, 6)? D = 0r Trying the different points: Pt (8,6) ⇒ ```
 Polynomials-and-rational-expressions/673225: the question says "an open rectangular tank with a square base of side x metres and with a volume of 8m³" how do i show that the surface area of the tank is x² + 32 x (thats meant to say say 32 over x but i cant get it to go as a fraction) 1 solutions Answer 418557 by ewatrrr(10682)   on 2012-10-29 12:07:27 (Show Source): You can put this solution on YOUR website! ``` Hi, an open rectangular tank with a square base of side x metres and with a volume of 8m³" V = h = This is an "Open tank" where length and width are x: S = S = ```
 Linear-systems/673227: Solve each system using elimination. Tell whether the system has no solution, one solution, or infinetly many solutions. -4x - 2y = 20 2x + y = 191 solutions Answer 418553 by ewatrrr(10682)   on 2012-10-29 11:52:34 (Show Source): You can put this solution on YOUR website! ``` Hi, -4x - 2y = 20 2x + y = 19 ||Multiplying 2nd EQ thru by 2 and adding to the 1st EQ 0 ≠ 58 NO solution for this systme of EQs ```
 Functions/673228: h(x)=x+10/x^2-1001 solutions Answer 418552 by ewatrrr(10682)   on 2012-10-29 11:47:37 (Show Source): You can put this solution on YOUR website! ``` Hi, ```
 Functions/673254: Find the domain of the composite function fog. f(x)=x²+8;g(x)=√x-1 f(x)=x²+8;g(x0=√x-1 f(g(x))=f(√x-1²+8 =√x-1²+8 The domain is all real numbers This is what I came up with, not sure if I am right or way off! Thanks for the help!1 solutions Answer 418551 by ewatrrr(10682)   on 2012-10-29 11:44:14 (Show Source): You can put this solution on YOUR website! ``` Hi, IF...what You have is... f(x) = x^2 + 8 and g(x) = fog(x) = x-1 + 8 = x + 7 ||Note: ```
 Probability-and-statistics/672339: For the regression equation, Y=bX+a, which of the following X,Y points will be on the regression line? a, a,b b, b,a c, 0,a (I think its c? ) d, 0,b A set of X and Y scores has SSx=10, SSY=20, and SP=8, what is the slope for the regression equation? a, 8/10 ( I think its a? ) b, 8/20 c, 10/8 d, 20/8 The following X and Y scores produce a regression equation of =4X-3. What is the value of SSresidual? X Y 1 2 2 3 3 10 a, 3 b, 6 ( I think its b? ) c, 15 d, 1071 solutions Answer 417924 by ewatrrr(10682)   on 2012-10-26 14:16:32 (Show Source): You can put this solution on YOUR website! ``` Hi, Y=bX+a, Yes. (0,a) Slope = SP/SSx = 8/10 Yes. SSresidual = SSy(1-r^2) = 38(1-(.9177)^2) = 6 Yes. to nearest whole number. X Y 1 2 2 3 3 10 ```
 Linear-equations/672311: I have this problem and I dont see how the answer book got the answer of -1. I am working on finding the slope of lines. This is the problem: 2x+2y+1=0. I cancel oout the 2y by divinding by 2 all aound. I come up with y=-x-1/2. My points are (0,-1/2) which I see then the answer book says (1,-3/2) which I dont see how they got that for the second point. Can you explain it to me. thank you!1 solutions Answer 417914 by ewatrrr(10682)   on 2012-10-26 12:50:39 (Show Source): You can put this solution on YOUR website! ``` Hi, 2x+2y+1=0 ⇒ Yes. Good work. IF x = 1 ⇒ Thus the listing for the (x,y) ordered pair (1,-3/2) ```
 Triangles/672315: ABC has vertices A(–2, 4), B(6, 0), and C(–4, 0). Is ABC a right triangle?1 solutions Answer 417913 by ewatrrr(10682)   on 2012-10-26 12:41:16 (Show Source): You can put this solution on YOUR website! ``` Hi, C(-4,0) A(-2,4) m = -4/-2 = 2 B(6,0) A(-2,4) m = -4/8 = -1/2 CA is perpendicular to BA, Yes ABC is a right triangle ```
 Graphs/672303: I need help! Please write the steps so I can work it and apply it to other problems. I thank you so much for your help! Write the equation of the circle in a standard form. Find the center, radius, intercepts, and graph the circle. x^2+y^2+12x+10y+61=161 solutions Answer 417898 by ewatrrr(10682)   on 2012-10-26 11:22:19 (Show Source): You can put this solution on YOUR website! ``` Hi, x^2+y^2+12x+10y+61=16 x^2+12x+y^2+10y= -45 x^2+12x+ 36 + y^2 + 10y + 25 = -45 + 36 + 25 C(-6,-5) and r = 4 Standard Form of an Equation of a Circle is where Pt(h,k) is the center and r is the radius ```
 Exponential-and-logarithmic-functions/672299: I need to solve the exponential equation: 3^(4x-1)=3^311 solutions Answer 417894 by ewatrrr(10682)   on 2012-10-26 11:11:18 (Show Source): You can put this solution on YOUR website! ``` Hi, 3^(4x-1)=3^31 ⇒ 4x-1 = 31 and x = 8 ```
 Complex_Numbers/672282: Show work, find the complex zeros of the polynomial function, and write f in factored form. f(x)=x⁴+22x²+21 1 solutions Answer 417893 by ewatrrr(10682)   on 2012-10-26 11:08:43 (Show Source): You can put this solution on YOUR website! ``` Hi, f(x) = x^4 + 22x^2 + 21 f(x) = (x^2 + 21)(x^2+1) (x^2 + 21)(x^2+1)= 0 , (x^2 + 21)= 0, x = ± 0r(x^2+1)= 0 x = ± i ```