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# Recent problems solved by 'ewatrrr'

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 Numeric_Fractions/633859: How you do 5/6 to %.1 solutions Answer 399217 by ewatrrr(10682)   on 2012-08-01 17:02:30 (Show Source): You can put this solution on YOUR website! ``` Hi, =.833 = percent ```
 Probability-and-statistics/633849: What is the distance between the two points (3, 2) and (–5, 6)? Which answer is it? a. square root 90 units b. square root 80 units c. square root 45 units d. square root 20 units1 solutions Answer 399206 by ewatrrr(10682)   on 2012-08-01 16:43:26 (Show Source): You can put this solution on YOUR website! ``` Hi, distance between the two points (3, 2) and (–5, 6) ```
 Linear-equations/633838: Write the equation of the line which passes through (2, 1) and is perpendicular to x = –2 show the work please Write the equation of the line which passes through (5, –2) and is parallel to x = 4 show work please1 solutions Answer 399193 by ewatrrr(10682)   on 2012-08-01 15:35:54 (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. line which passes through (2, 1) and is perpendicular to x = –2 New Line: m = 1/2 y = (1/2)x + b 1 = (1/2)·2 + b |Using ordered pair (x,y):(2,1) to solve for b 0 = b, y = (1/2)x or x-2y = 0 line which passes through (5, –2) and is parallel to x = 4 (vertical line!) New Line: vertical line, x = 5 ```
 Probability-and-statistics/633843: Determine the level of the confidence given the confidence coefficient z(α/2) for the following situation: z(α/2) = 2.58 1 solutions Answer 399190 by ewatrrr(10682)   on 2012-08-01 15:29:16 (Show Source): You can put this solution on YOUR website! ``` Hi, 99% level of the confidence a a/2 crtical regions 80% 0.2 10% z <-1.282 z >+1.282 90% 0.1 5% z <-1.645 z >+1.645 92% 0.8 4% z <-1.751 z >+1.751 95% 0.05 2.50% z <-1.96 z >+1.96 98% 0.02 1% z <-2.326 z >+2.326 99% 0.01 0.50% z<-2.576 z >+2.576 ```
 Quadratic-relations-and-conic-sections/633842: Find the foci of the ellipse: x squared / 4 + y squared / 9 = 11 solutions Answer 399188 by ewatrrr(10682)   on 2012-08-01 15:25:14 (Show Source): You can put this solution on YOUR website! ``` Hi, C(0,0) major axis along the y-axis foci ar (0, ± ) ```
 Probability-and-statistics/633833: A 99% confidence interval estimate for a population mean was computed to be (29.2, 46.6). Determine the mean of the sample, which was used to determine the interval estimate (show all work). 1 solutions Answer 399186 by ewatrrr(10682)   on 2012-08-01 15:17:38 (Show Source): You can put this solution on YOUR website! ``` Hi, and 29.2 + 8.7 = 37.9 = sample mean 37.9 - 8.7 < < 37.9 + 8.7 ```
 Graphs/633828: y=x²-4x+91 solutions Answer 399184 by ewatrrr(10682)   on 2012-08-01 15:07:47 (Show Source): You can put this solution on YOUR website! ``` Hi, y = x^2 - 4x + 9 |parabola, Pt(0,9) on the graph y = (x-2)^2 - 4 + 9 |completing Square to put in vertex form y = (x-2)^2 + 5 | V(2,5), 1>0 Opens Upward. Line of symmetry x = 2 Sketch ```
 Travel_Word_Problems/633823: A motorboat takes 5 hours to travel 300 going upstream. The return trip takes 3 hours going downstream. What is the rate of the boat in still water and what is the rate of the current?1 solutions Answer 399181 by ewatrrr(10682)   on 2012-08-01 14:44:13 (Show Source): You can put this solution on YOUR website! ``` Hi, What is the rate of the boat in still water and what is the rate of the current? Question states*** Note: D = rt or r = D/t r - c = 300/5 r + c = 300/3 2r = 160 r = 80mph and c = 20mph and... ```
 Expressions-with-variables/633825: 6ab+12a1 solutions Answer 399179 by ewatrrr(10682)   on 2012-08-01 14:31:28 (Show Source): You can put this solution on YOUR website! ``` Hi, Factoring 6ab+12a ⇒ 6a(b+ 2) ```
 test/633824: 1 solutions Answer 399178 by ewatrrr(10682)   on 2012-08-01 14:29:20 (Show Source): You can put this solution on YOUR website! ``` Hi, Inquiry did not post ```
 Polynomials-and-rational-expressions/633822: Factor each polynomial completely. 1.6+15w^5 2.7x^2+x Thanks so much for the help I truly appreciate it! 1 solutions Answer 399177 by ewatrrr(10682)   on 2012-08-01 14:27:45 (Show Source): You can put this solution on YOUR website! ``` Hi, Factor each polynomial completely. 1.6+15w^5 ⇒ 3(2+ 5w^5) 2.7x^2+x ⇒ x(7x+ 1) ```
 Radicals/633785: Simplify √(x-y)√(x+y)1 solutions Answer 399176 by ewatrrr(10682)   on 2012-08-01 14:25:14 (Show Source): You can put this solution on YOUR website! ``` Hi, Simplify √(x-y)√(x+y) ```
 Radicals/633733: √(x+1)+5=x+41 solutions Answer 399175 by ewatrrr(10682)   on 2012-08-01 14:22:15 (Show Source): You can put this solution on YOUR website! ``` Hi, Previously List ```
 Polynomials-and-rational-expressions/633783: Multiply and simplify (X^2)/(x-7)*(x^2-5x-14)/(x^2+4x)1 solutions Answer 399173 by ewatrrr(10682)   on 2012-08-01 14:18:40 (Show Source): You can put this solution on YOUR website! ``` Hi, previously Listed Multiply and simplify ```
 Miscellaneous_Word_Problems/633803: If Cynthia earns 400 dollars in 32 hours, how much does she earn in one hour?1 solutions Answer 399172 by ewatrrr(10682)   on 2012-08-01 14:14:57 (Show Source): You can put this solution on YOUR website! ``` Hi, If Cynthia earns 400 dollars in 32 hours, how much does she earn in one hour? dollars ```
 Probability-and-statistics/633818: By measuring the amount of time it takes a component of a product to move from one workstation to the next, an engineer has estimated that the standard deviation is 3.33 seconds. Answer each of the following (show all work): (A) How many measurements should be made in order to be 90% certain that the maximum error of estimation will not exceed 1.0 seconds? (B) What sample size is required for a maximum error of 0.5 seconds? 1 solutions Answer 399171 by ewatrrr(10682)   on 2012-08-01 14:13:40 (Show Source): You can put this solution on YOUR website! ``` Hi, standard deviation is 3.33 seconds. A) B) solve for n, rounding up ```
 Functions/633819: what is the range of the function f(x)=2/3x+5 when the domain is (-3,2,6)1 solutions Answer 399169 by ewatrrr(10682)   on 2012-08-01 14:06:39 (Show Source): You can put this solution on YOUR website!``` Hi, what is the range of the function f(x)=2/3x+5 when the domain is (-3,2,6) x f(x) = (2/3)x + 5 -3 3 2 19/3 6 9 ```
 Polynomials-and-rational-expressions/633808: Find the GCF: 1. -18t^3,24t^5 2. 6x^3,28x^2,48x Please help me asap thanks so much in advance! 1 solutions Answer 399167 by ewatrrr(10682)   on 2012-08-01 14:03:30 (Show Source): You can put this solution on YOUR website! ``` Hi, Find the GCF: 1. -18t^3,24t^5 GCF is 6t^3 2. 6x^3,28x^2,48x GCF is 2x ```
 Graphs/633791: Find the GCF: (greatest common factor) 1. -18t^3,24t^5 2. 6x^3,28x^2,48x Please help asap thanks so much in advance!1 solutions Answer 399166 by ewatrrr(10682)   on 2012-08-01 14:02:04 (Show Source): You can put this solution on YOUR website! ``` Hi, Find the GCF: (greatest common factor) 1. -18t^3,24t^5 GCF is 6t^3 2. 6x^3,28x^2,48x GCF is 2x ```
 Quadratic_Equations/633816: Find the x-coordinate of the vertex of the function given below. y=(x-7)(x+5),I tried doing the opposites but when I typed in the answer it said it was numerically incorrect. Could you please help, thanks1 solutions Answer 399161 by ewatrrr(10682)   on 2012-08-01 13:58:10 (Show Source): You can put this solution on YOUR website! ``` Hi, y=(x-7)(x+5) y= x^2 - 2x - 35 |completing the Square to fine the Vertex y=(x-1)^2 -1-35 y = (x-1)^2 - 36 V(1,-36) the vertex form of a Parabola opening up(a>0) or down(a<0), where(h,k) is the vertex and x = h is the Line of Symmetry ```
 Linear-equations/633812: How many gallons of a 4% acid solution should be mixed with 30 gallons of a 14% acid solution to obtain a mixture that is 8% acid?1 solutions Answer 399160 by ewatrrr(10682)   on 2012-08-01 13:47:28 (Show Source): You can put this solution on YOUR website! ``` Hi, How many gallons of a 4% acid solution should be mixed with 30 gallons of a 14% acid solution to obtain a mixture that is 8% acid? acid = acid .04x + .14·30 = .08(30-x) |Solve for x, may first multiply thru by 100 if you like ```
 Linear-equations/633800: Solve the system by substitution and determine whether the equations are independent, dependent, or inconsistent. Select one from below: 1.The solution set is {-4, -7}. The equations are dependent. 2.The solution set is {-1, -6}. The equations are independent. 3.The solution set is {-1, -7}. The equations are dependent 4.The solution set is {1, -1}. The equations are independent.1 solutions Answer 399159 by ewatrrr(10682)   on 2012-08-01 13:44:24 (Show Source): You can put this solution on YOUR website! ``` Hi, you did not list the system to be solved Note: A consistent system has at least one solution. An inconsistent system has no solutions. An independent system has exactly one solution. **** A dependent system has infinitely many solutions ```
 Linear-equations/633810: Write the equation of a line in slope-intercept form that has a slope of -2 and passes through the point (2, -8).1 solutions Answer 399158 by ewatrrr(10682)   on 2012-08-01 13:40:38 (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. Line with m = -2 and passing through Pt(2,-8) Line y = -2x + b 8 = -2·2 + b |Using ordered pair (x,y):(2,8) to solve for b 12 = b y = -2x + 12 ```
 Quadratic-relations-and-conic-sections/633806: what are the foci of the graph(y^(2))/(100)-(x^(2))/(34)=1?1 solutions Answer 399156 by ewatrrr(10682)   on 2012-08-01 13:37:28 (Show Source): You can put this solution on YOUR website! ``` Hi, C(0,0), Foci (0±, 0) Standard Form of an Equation of an Hyperbola opening up and down is: with C(h,k) and vertices 'b' units up and down from center, 2b the length of the transverse axis Foci units units up and down from center, along x = h & Asymptotes Lines passing thru C(h,k), with slopes m = ± b/a ```
 Polynomials-and-rational-expressions/633797: Multiply and simplify (X^2)/(x-7)*(x^2-5x-14)/(x^2+4x)1 solutions Answer 399152 by ewatrrr(10682)   on 2012-08-01 13:15:50 (Show Source): You can put this solution on YOUR website! ``` Hi, Multiply and simplify ```
 Radicals/633796: Solve √(x+1)+5=x+41 solutions Answer 399149 by ewatrrr(10682)   on 2012-08-01 12:55:14 (Show Source): You can put this solution on YOUR website! ``` Hi, x+1 = x^2-2x+1 |Squaring both sides of EQ x^2 -3x = 0 x(x-3) = 0 x = 3 (throwing out extraneous solution x = 0) and... ```
 Linear-equations/633792: How do you write the slope-intercept form of the equation of the line. Through: (-3,-3), perpendicular to y= -3x1 solutions Answer 399147 by ewatrrr(10682)   on 2012-08-01 12:50:17 (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. line. Through: (-3,-3), perpendicular to y= -3x New perpendicular Line m = 1/3 (negative reciprocal of -3) y = (1/3)x + b |Using ordered pair (x,y):(-3-3) to solve for b -3 = (1/3)*(-3) + b -2 = b y = (1/3)x -2 ```
 Polynomials-and-rational-expressions/633795: solve this proportion for hte variable x+2/x+6 = x-4/x-21 solutions Answer 399143 by ewatrrr(10682)   on 2012-08-01 12:40:34 (Show Source): You can put this solution on YOUR website! ``` Hi, |Cross Multiply to solve x^2 - 4 = x^2 +2x - 24 20 = 2x 10 = x and... ```
 Polynomials-and-rational-expressions/633788: simplify -a^2b^-2 divided by a^-2b^2/a^4b^-2 a. -a^8b^3 b. -a^4b^3 c. -a^4b^-7 d. -a^8b^-7 can someone please help me with this1 solutions Answer 399141 by ewatrrr(10682)   on 2012-08-01 12:36:57 (Show Source): You can put this solution on YOUR website! ``` Hi, -a^2b^-2 divided by a^-2b^2/a^4b^-2 (or multiplied by the reciprocal) ```
 Travel_Word_Problems/633789: A plane passes over a car going 300 mph heading south. The car is traveling at 70 mph going north. In how much time will they be 805 miles apart?1 solutions Answer 399139 by ewatrrr(10682)   on 2012-08-01 12:26:57 (Show Source): You can put this solution on YOUR website! ``` Hi, A plane passes over a car going 300 mph heading south. The car is traveling at 70 mph going north. In how much time will they be 805 miles apart? Question states*** Note D = rt 300t + 70t = 805mi t = 805mi/370mph ```
 Percentage-and-ratio-word-problems/633750: at the start of a trip the gas tank of a car is 3/4 full.After travelling and consuming 12 liters of fuel the gas tank is now 1/2 full. How many liters of fuel does the gas tank hold when full?1 solutions Answer 399137 by ewatrrr(10682)   on 2012-08-01 12:24:08 (Show Source): You can put this solution on YOUR website! ``` Hi, at the start of a trip the gas tank of a car is 3/4 full. After travelling and consuming 12 liters of fuel the gas tank is now 1/2 full. 1/4 tank is 12L How many liters of fuel does the gas tank hold when full ```