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# Recent problems solved by 'ewatrrr'

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 Trigonometry-basics/675752: if an object is propelled upward from a height of 64 feet at an initial velocity of 48 feet per second, then its height h after t seconds is given by the equation h=-16t^2+80t+48. after how many seconds did the object hit the ground1 solutions Answer 420035 by ewatrrr(10682)   on 2012-11-04 14:44:00 (Show Source): You can put this solution on YOUR website! Hi h= -16t^2+80t+48 = 0 (object hitting the ground) -16t^2+80t+48 = 0 16t^2-80t-48 = 0 t^2-5t-3 = 0 ||Positive value only for unit measure 0r -16(t-5/2)^2 + 100 + 48 = 0 -16(t-5/2)^2 + 148 = 0 t = 5/2 ± sqrt(148/16) t = 5/2 ± sqrt(37)/2
 Travel_Word_Problems/675725: two cars pass on a straight highway while traveling in opposite directions. One car is traveling 6 miles per hour faster than the other car. After 1.5 hours the two cars are 171 miles apart. Find the speed of each car.1 solutions Answer 420033 by ewatrrr(10682)   on 2012-11-04 14:30:42 (Show Source): You can put this solution on YOUR website! Hi two cars pass on a straight highway while traveling in opposite directions. One car is traveling 6 miles per hour faster than the other car. Speeds and After 1.5 hours the two cars are 171 miles apart. D = rt 1.5x + 1.5(x+6) = 171 ||Solve for x and List both speeds
 Probability-and-statistics/675744: what the probability that exacly 4 boys in 10 births1 solutions Answer 420030 by ewatrrr(10682)   on 2012-11-04 14:27:00 (Show Source): You can put this solution on YOUR website! Hi probability that exacly 4 boys in 10 births = Note: The probability of x successes in n trials is: P = nCx* where p and q are the probabilities of success and failure respectively. In this case p & q are = 1/2 or .5 and n = 10
 Inequalities/675748: how do you work 3(x+1)=7(x-2)-3 please and thank you1 solutions Answer 420028 by ewatrrr(10682)   on 2012-11-04 14:22:46 (Show Source): You can put this solution on YOUR website! Hi Use the Distributive Property and combine Like Terms 3x + 3 = 7x - 14 - 3 ||Adding -3x and 17 to both sides of the EQ 20 = 4x 5 = x
 Signed-numbers/675743: How do I write an equivalent expression without using grouping symbols: -(-9x3+8x+10). That -9x3 is -9x3 to the third power1 solutions Answer 420025 by ewatrrr(10682)   on 2012-11-04 14:20:02 (Show Source): You can put this solution on YOUR website! Hi
 Systems-of-equations/675729: 2r-s=10 Rd-s^2=121 solutions Answer 420024 by ewatrrr(10682)   on 2012-11-04 14:16:52 (Show Source): You can put this solution on YOUR website! Hi Assume you meant: 2r - s = 10 Or rs - s^2 = 12 |Multiplying thru by 2 so as all denominators = 1 (s+10)s - 2s^2 = 24 s^2 + 10s - 2s^2 = 24 10s - s^2 = 24 s^2 - 10s + 24 = 0 factoring (s-6)(s-4) = 0 (s-6) = 0 , s = 6 and r = 8 0r (s-4) = 0 , s = 4 and r = 7
 Probability-and-statistics/675733: can you please advise how to solve a P(at most ...), at least type probability type questions For example x P(x) 0 .07 1 .68 2 .21 3 .03 4 .01 The questions state find P for at least 1 cc and the P for at most 2 cc 1 solutions Answer 420021 by ewatrrr(10682)   on 2012-11-04 14:06:46 (Show Source): You can put this solution on YOUR website! Hi P(x ≥ 1) = 1 - P(x= 0) = 1-.07 =.93 P(x ≤ 2) = .07+.68 = .75 Or 1 - .21 - .03 - .01 = .75
 Travel_Word_Problems/675734: Chris and Gilbert drove a total of 522 miles in 8.2 hours. Chris drove the first part of the trip and averaged 65 miles per hour. Gilbert drove the remainder of the trip and averaged 55 miles per hour. For what length of the time did Chris drive?1 solutions Answer 420019 by ewatrrr(10682)   on 2012-11-04 14:00:48 (Show Source): You can put this solution on YOUR website! Hi Chris and Gilbert drove a total of 522 miles in 8.2 hours. Chris drove the first part of the trip and averaged 65 miles per hour. Gilbert drove the remainder of the trip and averaged 55 miles per hour. D = rt || solve for t, time Chris drove
 Linear-equations/675741: What is n, if the slope of line 1 is 11/8 and the coordinates of line 2 are (6,2n+1)?1 solutions Answer 420016 by ewatrrr(10682)   on 2012-11-04 13:57:45 (Show Source): You can put this solution on YOUR website! Hi Please repost, giving the realationship between line 1 and line 2
 Inequalities/675739: please help me solve 8(y+2)=2(3y+4) i tried 8y+16=6y+8 8y+6y=16+8 14y=24 then what?1 solutions Answer 420013 by ewatrrr(10682)   on 2012-11-04 13:56:20 (Show Source): You can put this solution on YOUR website! Hi 8(y+2)=2(3y+4) 8y+16=6y+8 Yes. Good work 8y + 16 -6y-16 = 6y + 8 - 6y - 16 ||Combining Like Terms(variable on one side,numbers on the other 2y = -8 y = -4
 Rational-functions/675737: for the function f(x)=2x^3 I need to complete a table of values containing at least 5 points In my table I have: x -2 -1 0 1 2 f(x)= I need to fill in the f(x) and totally lost 1 solutions Answer 420011 by ewatrrr(10682)   on 2012-11-04 13:53:06 (Show Source): You can put this solution on YOUR website! Hi the idea is that You substitute the x-value in the function given x f(x) = 2x^3 -2 -16 = -1 -2 0 0 1 2 2 16
 test/675713: I need help in Algebra 2 badly am failing this class I need to pass I got 9weeks worth of work and I can't get anything done because am behind and have no clue on what to do please help me thank you I need this badly1 solutions Answer 420010 by ewatrrr(10682)   on 2012-11-04 13:48:51 (Show Source): You can put this solution on YOUR website!On this site, you need to post concrete questions of the type You are currently having problems with
 Probability-and-statistics/675613: Consider the approximately normal population of heights of male college students with mean μ = 70 inches and standard deviation of σ = 6.4 inches. A random sample of 10 heights is obtained. Find the proportion of male college students whose height is greater than 72 inches. (Give your answer correct to four decimal places. I have worked this out several times and still get the same answer which is incorrect. HELP. Thanks1 solutions Answer 419979 by ewatrrr(10682)   on 2012-11-04 10:13:41 (Show Source): You can put this solution on YOUR website! Hi Re: TY, might consider, "A random sample of 10 heights is obtained" is not what the question is in reference to. "Find the proportion of male college students whose height is greater than 72 inches" P(x > 72) = 1 - P( z ≤ (72-70)/6.4) = 1 - P(z≤ .3125) = 1 - .6227 = .3773 μ = 70 , σ = 6.4 Find the proportion of male college students whose height is greater than 72 inches. SAMPLE: 10 heights P( x > 72) = 1 - P(= 1 -P(z=.9882) = 1-.8385 = .1615 TI normalcdf(z) gives the portion of the area under the standard normal curve to the LEFT of the z-value entered. Important to Understand z -values as they relate to the Standard Normal curve: Below: z = 0, z = ± 1, z= ±2 , z= ±3 are plotted. For ex: normalcdf(2) - normalcdf(-2) would give the portion of the area under the curve between those two z-values Note: z = 0 , 50% of the area under the curve is to the left and 50% to the right
 Probability-and-statistics/675624: Suppose certain coins have weights that are normally distributed with a mean of 5.338 g and a standard deviation of 0.068 g. A vending machine is configured to accept those coins with weights between 5.208 g and 5.468 g. a. If 250 different coins are inserted into the vending machine, what is the expected number of rejected coins? The expected number of rejected coins is____(Round to the nearest integer) ______________________________________________ If you could tell me how to do it rather than just give the answer that be helpful considering that kind of the point. Since i been following the example and i keep getting the wrong answer(online homework, infinite # of tries at the cost of 0.5 reduced per retry). Its kinda frustrating, since i been following the damn example and even other methods that i found googling. Also if you can explain it by using the TI-83 calculator that would be even better. What i been doing is (x-median)/Standard devuation, so: (5.208-5.338)/0.068 and (5.468 -5.338)/0.068 to get the Z score. After that i find the area to the right and left. Since i don't remember the formula or i don't know it. I google to look for it and i think its this one. http://homepage.smc.edu/mcgraw_colleen/math_52/Finding%20%20p-values.pdf So i do this after. Calculator TI-83 normalcdf(-10,result of (5.208-5.338)/0.068,) and normalcdf(result of(5.468 -5.338)/0.068,10) After that i sum their answers and finally i multiply it by 250. I haved tried but it says its wrong(only 3 tries till the right answer) Ty for your help.1 solutions Answer 419977 by ewatrrr(10682)   on 2012-11-04 09:57:14 (Show Source): You can put this solution on YOUR website! Hi μ = 5.338 , σ = .068 vending machine is configured to accept those coins with weights between 5.208 g and 5.468 g. SAMPLE: 250 different coins P(5.208 < x < 5.468) = P( - P( find this difference and multiply times 250 (rounding UP to the nearest integer ) TI normalcdf(z) gives the portion of the area under the standard normal curve to the LEFT of the z-value entered. Actually can do in one step for between two z-values: normalcdf(smaller z, larger z) Important to Understand z -values as they relate to the Standard Normal curve: Below: z = 0, z = ± 1, z= ±2 , z= ±3 are plotted. For ex: normalcdf(2) - normalcdf(-2) would give the portion of the area under the curve between those two z-values Note: z = 0 , 50% of the area under the curve is to the left and 50% to the right
 Travel_Word_Problems/675627: Anna took her scooter and headed to the beach driving 20 mph. Breanna left two hours later and also headed to the beach on her scooter driving 20 mph. How many hours did Anna drive before Breanna caught up with her?1 solutions Answer 419972 by ewatrrr(10682)   on 2012-11-04 09:30:12 (Show Source): You can put this solution on YOUR website! Hi taveling at the same speed..there is going to be NO 'catching-up' by Brenna
 Permutations/675628: an exploration team of 2 women and 3 men is to be chosen from a candidate pool of 6 women and 7 men. how many different ways can this team of 5 be formed?1 solutions Answer 419971 by ewatrrr(10682)   on 2012-11-04 09:27:52 (Show Source): You can put this solution on YOUR website! Hi an exploration team of 2 women and 3 men is to be chosen from a candidate pool of 6 women and 7 men. how many different ways can this team of 5 be formed? ways
 Graphs/675632: Would you please help me with this: 1. In golf, scores are calculated relative to the par of the golf course. Par is 0 on a number line. Given the following information, list the golfers in order from best (lowest score) to worst (highest score) on a number line. Then tell by how many strokes Woods beat Couples. Golfer: (Furyk) - (Woods) - (Daly ) - (Couples) Score: (3 under par) -(6 under par) - ( 1 over par) - ( 6 over par) Thanks 1 solutions Answer 419970 by ewatrrr(10682)   on 2012-11-04 09:26:15 (Show Source): You can put this solution on YOUR website! Hi Woods: 6 under par Furyk: 3 under par Daly: 1 over par Couples: 6 over par Woods beat Couples by 12 strokes
 Age_Word_Problems/675339: a boy was asked to multiply a certain number by 60.he multiplied it by 30 and got his answer lessthan the correct one by by 400. find the number which has to be multiplied1 solutions Answer 419765 by ewatrrr(10682)   on 2012-11-03 10:23:30 (Show Source): You can put this solution on YOUR website! Hi 60n = 30n + 400 30n = 400 n = 400/30 = 40/3 0r and
 Linear_Equations_And_Systems_Word_Problems/675341: Barney has some money. He spends £10 on a meal and then one-quarter of what he has left on a taxi home. He now has half of what he started with. How much did Barney have at the start? I first thought that since he had half left and said that he spent 1/4 on the taxi, the £10 that he spent on the meal must have also been 1/4 so he must have begun with £40 however compared to the other questions in the homework paper it seemed to obvious? Please help!1 solutions Answer 419763 by ewatrrr(10682)   on 2012-11-03 10:17:09 (Show Source): You can put this solution on YOUR website! Hi He spends £10 on a meal and then one-quarter of what he has left on a taxi home. He now has half of what the he started with. Best to Set it Up Algebraically: |Multiplying thru by 4 so as all denominators = 1 4x-40 - (x-10) = 2x x = £30, amount he started with and... £30 - £10 - £5 = £15
 Probability-and-statistics/675276: suppose a computer virus begins by infecting 8 computers in the first hour after it is released. each hour after that, each newly infected computer causes 8 more computers to become infected. the function y=8^x models this situation.make a table with integer values of x from 1 to 41 solutions Answer 419761 by ewatrrr(10682)   on 2012-11-03 10:06:02 (Show Source): You can put this solution on YOUR website! Hi suppose a computer virus begins by infecting 8 computers in the first hour after it is released. each hour after that, each newly infected computer causes 8 more computers to become infected. the function y=8^x models this situation.make a table with integer values of x from 1 to 4 x y = 8^x 1 8 2 64 3 512 4 4096
 Quadratic_Equations/675245: The value of a stock in dollars at the end of each month in 1992 varied according to the equation c(x) = 1/4x^2 - 2x + 6 where x represents the number of months. a)For how many months did the stock decrease? b)For how many months did the stock increase?1 solutions Answer 419758 by ewatrrr(10682)   on 2012-11-03 09:48:31 (Show Source): You can put this solution on YOUR website! Hi The value of a stock in dollars at the end of each month in 1992 varied according to the equation c(x) = 1/4x^2 - 2x + 6 = 1/4(x-4)^2 + 2 where x represents the number of months. a)For how many months did the stock decrease? 4 mos b)For how many months did the stock increase? 8mos Might recommend Your downloading this FREE graph software
 Rational-functions/675296: Is y=1/4x^0.5 a function? Why or why not? 1 solutions Answer 419756 by ewatrrr(10682)   on 2012-11-03 09:30:11 (Show Source): You can put this solution on YOUR website! Hi Is y = 1/4x^0.5 a function? yes, satisfies the vertical Line test. Might recommend downloading the following FREE graph software
 Miscellaneous_Word_Problems/675320: what is the weight of a cuboidal block of ice of each edge 60cm in lenght if one cubic meter of ice weights 900 kilograms. 1 solutions Answer 419749 by ewatrrr(10682)   on 2012-11-03 09:12:41 (Show Source): You can put this solution on YOUR website! Hi what is the weight of a cuboidal block of ice of each edge 60cm in lenght if one cubic meter of ice weights 900 kilograms. 1m = 100cm, 60cm = .6m, (.6)^3 = .216m^3,
 Systems-of-equations/675331: 64^5/6 reduce and rationalize when required1 solutions Answer 419746 by ewatrrr(10682)   on 2012-11-03 09:07:09 (Show Source): You can put this solution on YOUR website! Hi
 Triangles/675333: Find the radius of a spherical tank that has a volume of cubic meters1 solutions Answer 419744 by ewatrrr(10682)   on 2012-11-03 09:05:11 (Show Source): You can put this solution on YOUR website! Hi
 Quadratic-relations-and-conic-sections/675116: How do you find the center and the foci of the conic section 25x2+50x-9y2-18y-209=01 solutions Answer 419605 by ewatrrr(10682)   on 2012-11-02 14:34:28 (Show Source): You can put this solution on YOUR website! Hi Standard Form of an Equation of an Hyperbola opening right and left is: with C(h,k) and vertices 'a' units right and left of center, 2a the length of the transverse axis Foci are units right and left of center along y = k 25x2+50x-9y2-18y-209=0 || putting into Standard form 25(x+1)^2 - 9(y+1)^2 - 25 + 9 - 209 = 0 25(x+1)^2 - 9(y+1)^2 = 225 center: C(-1,1) foci: F(-1+,1) and F(-1-,1)
 Probability-and-statistics/675165: A sample of 4 different calculators is randomly selected from a group containing 16 that are defective and 30 that have no defects. What is the probability, as a decimal, that at least one of the 4 calculators in the sample is defective?1 solutions Answer 419604 by ewatrrr(10682)   on 2012-11-02 14:19:12 (Show Source): You can put this solution on YOUR website! Hi A sample of 4 different calculators is randomly selected from a group containing 16 that are defective and 30 that have no defects: in all P(at least 1 defective) = 1 -P(none defective) = 1 -
 Probability-and-statistics/675164: If you are dealt two cards successively (with replacement of the first) from a standard deck of 52 playing cards, find the probability, as a fraction, of getting a heart as the first card and a diamond as the second. 1 solutions Answer 419603 by ewatrrr(10682)   on 2012-11-02 14:15:33 (Show Source): You can put this solution on YOUR website! Hi If you are dealt two cards successively (with replacement of the first) from a standard deck of 52 playing cards P(H then D) =
 Travel_Word_Problems/675155: Jonathon was traveling through the French countryside on his motorcycle going 76 kilometers per hour. What was his speed in meters per minute?1 solutions Answer 419601 by ewatrrr(10682)   on 2012-11-02 13:39:39 (Show Source): You can put this solution on YOUR website! Hi = 1266.7m/min
 Unit_Conversion_Word_Problems/675151: The smallestbaby born in good health weighed only 8.6 oz, less than a can of soda. She was born in chicago in Dercember 2004. How much lighter was she than an average baby, who weighs about 7lb 8 oz? 1 solutions Answer 419599 by ewatrrr(10682)   on 2012-11-02 13:35:16 (Show Source): You can put this solution on YOUR website! Hi 7lb 8 oz - 0lb 8.6 oz 6lb 24.0 oz || Borrowing 1 lb 0r 16oz, so as able to subtract ounces - 0lb 8.6 oz = 6lb 15.4 oz lighter
 Quadratic_Equations/675123: using the method for solving quadratic equations from India, answer this question please. 2 X-2x-13=0 that is x squared -2x-13=0 Thank you for your help and please show your work so I can understand how to do this. Thank you. I am sure you are aware of this method from India, it breaks down like this, a) move the constant term to the right side of the equation, b) multiply each term in the equation by four times the coefficient of the X squared term, c) squared the coefficient of the original X term and add it to both sides of the equation, D) take the square root of both sides, E) set the left side of the equation equal to the positive square root of the number on the right side and solve for x, F) set the left side of the equation equal to the negative square root of the number on the right side of the equation and solve for X1 solutions Answer 419598 by ewatrrr(10682)   on 2012-11-02 13:30:54 (Show Source): You can put this solution on YOUR website! Hi, Here is one as an example that was just previously posted x2+12x-5=0 x2+12x = 5 4x2+48x = 20 4x2+48x+144 = 164 = ± sqrt(164) 2x + 12 = 2sqrt(41) x = -6 +sqrt(41) 2x + 12 = -2sqrt(41) x = -6 -sqrt(41) Checking using 'Completing the Square' (x+6)^2 = 5 + 36 x+6 = ±sqrt(41) x = -6 ±sqrt(41)