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# Recent problems solved by 'ewatrrr'

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 test/657935: Solve for r C= 2(pie)r1 solutions Answer 410072 by ewatrrr(10682)   on 2012-09-27 09:52:39 (Show Source): You can put this solution on YOUR website! ``` Hi, ```
 Equations/657942: Find 12% of 50. 1 solutions Answer 410068 by ewatrrr(10682)   on 2012-09-27 09:40:45 (Show Source): You can put this solution on YOUR website! ``` Hi, 12% of 50 is ```
 Word_Problems_With_Coins/657929: The difference of x and a number is 6. What is the other number? 1 solutions Answer 410067 by ewatrrr(10682)   on 2012-09-27 09:38:59 (Show Source): You can put this solution on YOUR website! ``` Hi, The difference of x and a number is 6 Question states*** x - n = 6 || Adding n and subtracting 6 from both sides of EQ x-6 = n ```
 Finance/657941: Can you help me solve: C=5/9(F-32) for F. 1 solutions Answer 410064 by ewatrrr(10682)   on 2012-09-27 09:35:06 (Show Source): You can put this solution on YOUR website! ``` Hi, C=5/9(F-32) (9/5)C= F-32 ```
 Probability-and-statistics/657915: A batch of 200 calculators contains 3 defective calculators. a) In how many ways can a sample of three calculators have no defective calculators? b) In how many ways can a sample of three calculators have all defective calculators c) In how many ways can a sample of three calculators have at least one defective calculators?1 solutions Answer 410055 by ewatrrr(10682)   on 2012-09-27 08:17:00 (Show Source): You can put this solution on YOUR website! ``` Hi, A batch of 200 calculators contains 3 defective calculators. sample of three calculators # of ways this sample can have no defective calculators? # of ways this sample can have all defective calculators? # of ways this sample can have AT LEAST one defective calculators? - ```
 Radicals/657905: Please simplify for √ (300x^7) 1 solutions Answer 410054 by ewatrrr(10682)   on 2012-09-27 08:09:20 (Show Source): You can put this solution on YOUR website! ``` Hi, ```
 Radicals/657906: Please reduce for √ (125x^5) + 3√ 5x 1 solutions Answer 410053 by ewatrrr(10682)   on 2012-09-27 08:07:44 (Show Source): You can put this solution on YOUR website! ``` Hi, ```
 Functions/657907: I don't understand the breakdown in how to figure out this problem: 1/3(x+9)-1/4(x-4)=x-81 solutions Answer 410051 by ewatrrr(10682)   on 2012-09-27 08:04:06 (Show Source): You can put this solution on YOUR website! ``` Hi, |Multiplying thru by 12 so as all denominators = 1 4(x+9) - 3(x-4) = 12(x-8) || Solve for x ```
 Functions/657902: A rectangle is 2 feet wide and 3 feet long. Each side is increased by the same amount to give a rectangle with twice the area of the original one. Find the dimensions of the new rectangle. (Hint: Let x feet be the amount by which each side is increased.)1 solutions Answer 410050 by ewatrrr(10682)   on 2012-09-27 08:00:29 (Show Source): You can put this solution on YOUR website! ``` Hi, A rectangle is 2 feet wide and 3 feet long. A = Each side is increased by the same amount to give a rectangle with twice the area of the original one. Question states*** (x+2)(x+3) = 12 x^2 + 5x + 6 = 12 x^2 + 5x - 6 = 0 (x + 6) = 0 (x-1) = 0 x = 1 (throwing out negative solution for unit measurement) New rectangle is 3ft by 4ft ```
 Money_Word_Problems/657895: A contractor engages 16 men to build a wall 80 metres long and estimated that they will do the work in 10 day. After they have worked for 8 days at this rate, he is told that the wall must be made 10 metres longer than originally planned. How many more men must be engaged to complete the work within the agreed time?1 solutions Answer 410047 by ewatrrr(10682)   on 2012-09-27 07:54:33 (Show Source): You can put this solution on YOUR website! ``` Hi, 16 men to build a wall 80 metres long in 10days ⇒ 8m/day 0r 64m in 8days 80-64 = 16, 16+10 = 26m must be built in 2 days. @man can build 1/2m per day or 1m in 2 days. Would take 26 men working 2 days for the 26m needed. more men must be engaged to complete the work within the agreed time ```
 Functions/657898: if the function f is defined for all numbers x by f (x)=2x-7 then what is the value of (-2)1 solutions Answer 410044 by ewatrrr(10682)   on 2012-09-27 07:41:06 (Show Source): You can put this solution on YOUR website! ``` Hi, f(x)=2x-7 f(-2) = ```
 Rate-of-work-word-problems/657887: Working 8 hours a day, 24 men do a piece of work in 15 days. Find how many days it would take 16 men working 9 hours a day, to do the same piece of work1 solutions Answer 410043 by ewatrrr(10682)   on 2012-09-27 07:39:18 (Show Source): You can put this solution on YOUR website! ``` Hi, Working 8 hours a day, 24 men do a piece of work in 15 days how many days it would take 16 men working 9 hours a day || Solve for x ```
 Geometry_Word_Problems/657892: find the point midway between the given points a.A(3,4)B,(-3,-2) b.Psub1(-4,6),Psub2(2,-3)1 solutions Answer 410042 by ewatrrr(10682)   on 2012-09-27 07:31:13 (Show Source): You can put this solution on YOUR website! ``` Hi, bisect the segment connecting A(4,-3) and B(-6,4) Midpoint of AB: Midpoint Pt(x,y): ( , ) A(3,4) B(-3,-2) Midpoint (0,1) Psub1(-4,6), Psub2(2,-3) Midpoint (-1,3/2) ```
 Geometry_Word_Problems/657893: bisect the segment connecting A(4,-3) and B(-6,4)1 solutions Answer 410041 by ewatrrr(10682)   on 2012-09-27 07:29:06 (Show Source): You can put this solution on YOUR website! ``` Hi, bisect the segment connecting A(4,-3) and B(-6,4) Midpoint of AB: Midpoint Pt(x,y): ( , ) A(4,-3) and B(-6,4) Midpoint (-1,.5) ```
 Geometry_Word_Problems/657894: in a triangle with vertices A(3,8) B(7,2) and C(0,1), find the length of the median drawn to the side BC1 solutions Answer 410040 by ewatrrr(10682)   on 2012-09-27 07:26:45 (Show Source): You can put this solution on YOUR website! ``` Hi, triangle with vertices A(3,8) B(7,2) and C(0,1), find the length of the median drawn to the side BC Midpoint of BC: Midpoint Pt(x,y): ( , ) B(7,2) and C(0,1) Midpoint (3.5,1.5) the length of the median: Distance: D = (3.5,1.5) (3,8) D = ```
 Geometry_Word_Problems/657897: Find the center of a circle whose endpoints of the diameter are A(1/2) and B(-2/3,-1/2)1 solutions Answer 410039 by ewatrrr(10682)   on 2012-09-27 07:19:25 (Show Source): You can put this solution on YOUR website! ``` Hi, Note: Center of the Circle is at the Midpoint of this diameter endpoints of the diameter are: Midpoint Pt(x,y): ( , ) A(1/2,5) and B(-2/3,-1/2) Midpoint (-1/12, 9/4) ```
 Quadratic-relations-and-conic-sections/657484: convert the ellipse -16y+52=-2x^2-8x-y^21 solutions Answer 409890 by ewatrrr(10682)   on 2012-09-26 16:31:08 (Show Source): You can put this solution on YOUR website! ``` Hi, -16y+52=-2x^2-8x-y^2 2x^2+8x+y^2-16y = -52 2(x+2)^2 + (y-8)^2 = -52 + 8 + 64 2(x+2)^2 + (y-8)^2 = 20 Standard Form of an Equation of an Ellipse is where Pt(h,k) is the center ```
 Probability-and-statistics/657438: Approximately 10.3 percent of students drop out during the school year. Assuming the varaible is binomial. Choose 13 students at random, and find the probabilities if: No more than two students drop out: At least 10 graduate: All 13 stay in school and graduate:1 solutions Answer 409883 by ewatrrr(10682)   on 2012-09-26 15:52:31 (Show Source): You can put this solution on YOUR website!when listing bionomial probability problems, please list what You are using to find the probilities: For example: Scientific Calculator only TI 83 Excel function
 Probability-and-statistics/657385: Assume a normally distributed population with µ = 80 and σ = 5. What is the probability that a score in the distribution is between 87 and 93?1 solutions Answer 409880 by ewatrrr(10682)   on 2012-09-26 15:50:12 (Show Source): You can put this solution on YOUR website!when listing probability problems, please list what You are using to find the probilities: For example: Chart TI 83 Excel function
 Linear_Equations_And_Systems_Word_Problems/657439: 840 stickers were given to 42 children. 2/3 of the children were boys, and each of them received the same number of stickers. Each girl received twice a many stickers as each boy. How many stickers did each girl receive? I do not have any idea where to even begin with this word problem.... the only concept I have in my head is and that just looks completely wrong. 1 solutions Answer 409867 by ewatrrr(10682)   on 2012-09-26 15:16:26 (Show Source): You can put this solution on YOUR website! ``` Hi, 42 children, 2/3 of the children were boys ⇒ 28 boys and 14 girls Each boy received the same number of stickers, girls Question states***840 stickers 28x + 14·2x = 840 56x = 840 x = 15, number of tickets each boy had. Each girl had 30 tickets. and... ```
 Money_Word_Problems/657417: what simple interest rate will Susan need to secure to make \$2,500 in interest on a \$10,000 principal over 5 years?1 solutions Answer 409863 by ewatrrr(10682)   on 2012-09-26 15:05:51 (Show Source): You can put this solution on YOUR website! ``` Hi, simple interest 2500/10000 = 5r 500/10000 = r = .05% ```
 Probability-and-statistics/657426: A coin is tossed, then a six sided die is rolled. Find the probibility of head and 5. Someone show me how to do this^^!!!!1 solutions Answer 409862 by ewatrrr(10682)   on 2012-09-26 14:54:10 (Show Source): You can put this solution on YOUR website! ``` Hi, Independent Events P(heads) = 1/2 (experiment has a total of 2 possible outcomes) P(5) = 1/6 (experiment has a total of 6 possible outcomes) P(heads 'and' 5) = ```
 Equations/657390: Hi, I am so stuck on half lives of Radioactive isotope in science. I thought I had the correct answer to these questions, but they are not. Please help me. I need to know if you have 2 grams of Carbon-14, after 5760 years there would be how many grams left? If you how 2 grams of Carbon-14, after 11520 years there would be how many grams left? If you have 2 grams of Carbon-14, after 23040 years there would be how many grams left? Please break this down to me. I am SO comfused. Thanks1 solutions Answer 409861 by ewatrrr(10682)   on 2012-09-26 14:49:44 (Show Source): You can put this solution on YOUR website! ``` Hi, where k = .00012 (assume this is the k You are using) ```
 Distributive-associative-commutative-properties/657395: how do you express (4a-3) squared as a trinomial? my teacher says to FOIL but i dont know how. iv gotten 16a squared -9 but i dont think it is right. 1 solutions Answer 409858 by ewatrrr(10682)   on 2012-09-26 14:24:30 (Show Source): You can put this solution on YOUR website! ``` Hi, (4a-3)^2 (4a-3)(4a-3) = 16a^2 - 24a + 9 When using FOIL, the 'middle'term is the sum of the outside and inside products F First terms 16a^2 O Outside terms -12a I Inside terms -12a L Last terms (-3)(-3) = 9 ```
 Signed-numbers/657402: How do I use the order of operations to simplify the expression 2(1/4 +1/3)+21 solutions Answer 409857 by ewatrrr(10682)   on 2012-09-26 14:17:46 (Show Source): You can put this solution on YOUR website! ``` Hi, "PEMDAS", "Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction". 2(1/4 +1/3)+2 || Parentheses: ||Multiplication || Addition ```
 Money_Word_Problems/657406: **THIS IS AN EDITED QUESTION, I REALIZED I LEFT OUT A FRACTION IN THE PROBLEM** Mrs.Suarez bought 3 pairs of jeans and 5 shirts for \$441. If each pair of jeans cost 2/3 as much as each shirt, What was the price of each pair of jeans? What was the price of each shirt? I am not sure about the formula I've put together for this question; x=36.75 And I've gathered if that is the price of a shirt, then the price of a pair of jeans must be \$24.50. But when I plugged in those two values to the original equation, it didnt check out. What am I doing wrong? 1 solutions Answer 409856 by ewatrrr(10682)   on 2012-09-26 14:11:27 (Show Source): You can put this solution on YOUR website! ``` Hi, each pair of jeans cost 2/3 as much as each shirt shirt cost: x jean cost: Question states***bought 3 pairs of jeans and 5 shirts for \$441 7x = \$441 x = \$63, shirt cost. Jean cost is \$42 and... ```
 Numbers_Word_Problems/656790: In testing a new drug, reseachers found that 5% of all patients using it will have a mild side effect. A random sample of 12 patients using the drug is selected. Find the probability that: (A) EXACTLY TWO will have this mild side effect. (B) AT LEAST two will have this mild side effect. ___________________________________________________ This is my work ------> n= 12 p=0.05 mean=n*p mean= 12*0.05 result is: mean=0.6 am I on the right track or off the tracks? with explaination so I can learn this and quit bugging you guys. Please help!!!! 1 solutions Answer 409645 by ewatrrr(10682)   on 2012-09-25 13:16:17 (Show Source): You can put this solution on YOUR website! ``` Hi, Re: TY, w/o capability of using Your own calculator, the only option would be using an on-line site like the following, which is relatively uncomplicated calculator to enter the information given: http://stattrek.com/online-calculator/binomial.aspx P(x = 2) = .0988 (rounding to 4 decimal places) P(x≥ 2) = .1184 Important thing to understand is with only 5% having a mild side effct... Probability of even 2 out of 12 people having a side effect is very small. This is a case of Bionomial Probability Distribution Note: The probability of x successes in n trials is: P = nCx* where p and q are the probabilities of success and failure respectively. this case p = .05 & q = .95 and n = 12 nCx = P(x = 2) = 12C2(.05)^2(.95)^10 0r binompdf(12,.05,2) using TI83 P(x ≥ 2) = 1- P(x <2) = 1-P(0) - P(1) 0r 1 - binomcdf(12,.05,1) using TI83 ```
 Surface-area/656774: if 3/5 of the a square is 135cm2 what is the area of the square?1 solutions Answer 409639 by ewatrrr(10682)   on 2012-09-25 12:31:01 (Show Source): You can put this solution on YOUR website! ``` Hi, if 3/5 of the a square is 135cm2 what is the area of the square? Question states*** A = 225 cm^2 ```
 Average/656771: The sum of two numbers is 64 and the difference is 6 . What are the numbers? 1 solutions Answer 409635 by ewatrrr(10682)   on 2012-09-25 12:23:52 (Show Source): You can put this solution on YOUR website! ``` Hi, The sum of two numbersand is 64 and the difference is 6 Question states*** x + y = 64 x - y = 6 || Adding the EQs to eliminate y 2x = 70 x = 35 and y = 29 ```
 Quadratic-relations-and-conic-sections/656691: help me find the equation of the parabola with its vertex at (-1, 2) and its focus at (4, 2) 1 solutions Answer 409633 by ewatrrr(10682)   on 2012-09-25 12:09:05 (Show Source): You can put this solution on YOUR website! ``` Hi, the vertex form of a Parabola opening right(a>0) or left(a<0), where(h,k) is the vertex and y = k is the Line of Symmetry The standard form is , where the focus is (h +p,k ) parabola with its vertex at (-1, 2) and its focus at (4, 2) , , p = 5, 4p = 20 , ```
 Equations/656764: Marisa and Shandrell ran for student body president. Of the 1308 votes cast, Shandrell received 16 less than three timnes as many votes as Marisa. How many votes did each canidate receive/1 solutions Answer 409630 by ewatrrr(10682)   on 2012-09-25 11:53:52 (Show Source): You can put this solution on YOUR website! ``` Hi, Shandrell received 16 less than three times as many votes as Marisa's Marisa's : x Shandrell's: 3x-16 Question states***1308 votes cast x + (3x-16) = 1308 4x = 1324 x = 331, Marisa's vote. Shandrell had 977. and... ```