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Recent problems solved by 'edjones'

edjones answered: 7568 problems
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Radicals/435515: What is the conjugate of each expression?? 1. square root of 6 plus the square root of 3 1 solutions Answer 301458 by edjones(7569)   on 2011-04-14 00:12:47 (Show Source): You can put this solution on YOUR website! sqrt(6)-sqrt(3)

Evaluation_Word_Problems/435519: the formula A=10.1e^0.005t models the population of Los Angeles, in millions, t years after 1995. if the growth rate continues into the future, when will the population reach 13 million? 1 solutions Answer 301455 by edjones(7569)   on 2011-04-14 00:04:52 (Show Source): You can put this solution on YOUR website! A=10.1e^0.005t 10.1e^0.005t=13 e^0.005t=13/10.1 ln(e^0.005t)=ln(13/10.1) 0.005t=ln(13/10.1) t=50.48 yrs 1995+50=2045 . Ed

Polynomials-and-rational-expressions/435546: 15a^2-65a-50 1 solutions Answer 301452 by edjones(7569)   on 2011-04-13 23:52:00 (Show Source): You can put this solution on YOUR website! 15a^2-65a-50 =5(3a^2-13a-10) 3*-10=-30. the two factors of -30 whose sum is -13 are +2 and -15. =5(3a^2+2a-15a-10) =5(a(3a+2)-5(3a+2)) Factoring by grouping. =5(a-5)(3a+2) . Ed

Probability-and-statistics/435549: Hi! I need help with a probability question: You have three bags. Bag 1 contains two red balls and 5 green balls. Bag 2 contains 5 red balls and 3 green balls. Bag three contains a red ball and a green ball. You roll a fair six sided die and pick a ball out of Bag 1 if the die lands on 1. You pick a ball out of Bag 2 if the die lands on 2, 3, or 4. You pick a ball out of Bag 3 if the die lands on 5 or 6. What is the probability that you pick a red ball? Thank you for your help! 1 solutions Answer 301449 by edjones(7569)   on 2011-04-13 23:39:18 (Show Source): You can put this solution on YOUR website! Probability of a R ball from bag 1 is 2/7 Probability of a R ball from bag 2 is 5/8 Probability of a R ball from bag 3 is 1/2 (1/6 * 2/7)+(3/6 * 5/8)+(2/6 * 1/2) =59/112 the probability that you pick a red ball. . Ed

Permutations/435595: In how many ways can a committee of five people be selected from seven women and nine men if at least one woman must be in the committee? 1 solutions Answer 301445 by edjones(7569)   on 2011-04-13 23:19:29 (Show Source): You can put this solution on YOUR website! nCr=combination of n things taken r at a time. 16C5-9C5 =4368-126 =4242 ways . Ed

Probability-and-statistics/435573: three cards are drawn from a deck without replacement. find the probabilities as a simple fraction . a) all are jacks b) all are clubs c) all are red card 1 solutions Answer 301441 by edjones(7569)   on 2011-04-13 23:10:39 (Show Source): You can put this solution on YOUR website! a)4/52 * 3/51 * 2/50 = 1/5525 . b)13/52 * 12/51 * 11/50 = 11/850 . c)26/52 * 25/51 * 24/50 = 2/17 . Ed

Permutations/435586: How many ways are there for a horse race with three horses to finish if ties are possible?(Note: Two or three horses may tie) Thanks a lot . . . 1 solutions Answer 301436 by edjones(7569)   on 2011-04-13 22:59:24 (Show Source): You can put this solution on YOUR website! 3!=3*2=6 ways w/o ties. 4 ways to tie. 6+4=10 total ways. . Ed

Linear_Equations_And_Systems_Word_Problems/435587: Chandra can milk a cow in 1/2 the time of elsa. Together they can milk the cows in 45 minutes. How long would it take elsa to milk the cows by herself. Show how to find the answer 1 solutions Answer 301434 by edjones(7569)   on 2011-04-13 22:55:52 (Show Source): You can put this solution on YOUR website! Let x=time it takes chandra. 2x= time it takes elsa. 2x+x=45 3x=45 x=15 min 2x=30 min time it takes elsa. . Ed

Permutations/434605: How many different ways can the letters alaska be arranged 1 solutions Answer 301040 by edjones(7569)   on 2011-04-12 11:16:11 (Show Source): You can put this solution on YOUR website! nPr=Permutation of n things taken r at a time. 6!/3! =6*5*4*3!/3! =6*5*4 =120 ways . Ed

Probability-and-statistics/434609: A home security system is designed to be triggered in 95% of attempted burglaries. If 7 homes equipped with such a system experience an attempted burglary, find the probability that fewer than 5 alarms are triggered. Round your answer to four decimal places. 1 solutions Answer 301039 by edjones(7569)   on 2011-04-12 11:10:01 (Show Source): You can put this solution on YOUR website! p=.95, q=.05 p^7+7p^6q+21p^5q^2 =.9962 Probability that 5, 6 or 7 alarms are triggered. 1-.9962 = .0038 the probability that fewer than 5 alarms are triggered. . Ed

Probability-and-statistics/434623: A normal die is thrown 10 times. What is the probability that a 6 is thrown 8 or more times? Write your answer corrected to three significant figures. 1 solutions Answer 301037 by edjones(7569)   on 2011-04-12 10:54:38 (Show Source): You can put this solution on YOUR website! p=1/6, q=5/6 p^10+10p^9q+45p^8q^2 =.0000194 . Ed

Probability-and-statistics/434625: A die is thrown and a card is drawing from a ‘normal’ pack of cards. What is the probability that ‘the score on the die is 2, 3, 4, or 5’ or ‘the card is a spade’? Thanks in advance! 1 solutions Answer 301036 by edjones(7569)   on 2011-04-12 10:44:11 (Show Source): You can put this solution on YOUR website! 4/6 * 13/52 = 1/6

Probability-and-statistics/434626: A ‘hand’ of 5 cards is dealt at random from a normal pack of playing cards What is the probability of the hand containing 5 of the same suit (e.g. five clubs)? Thanks in advance! 1 solutions Answer 301035 by edjones(7569)   on 2011-04-12 10:39:04 (Show Source): You can put this solution on YOUR website! nCr=combination of n things taken r at a time. 4(13C5)/52C5 There are 4 suits of 13 cards each. =(4*1287)/2598960 =.00198 . Ed

test/434463: 48/2(9+3) 1 solutions Answer 300997 by edjones(7569)   on 2011-04-11 20:53:09 (Show Source): You can put this solution on YOUR website! 48/2(9+3) =48/2(12) =48/24 =2 . Ed

Graphs/434466: ben bowled 135 and 180 in his first two games. what must he bowl in his third game to have an average of at least 170 1 solutions Answer 300995 by edjones(7569)   on 2011-04-11 20:50:58 (Show Source): You can put this solution on YOUR website! 135+180+x>=3*170 315+x>=510 x>=195 . Ed

Complex_Numbers/434455: RATIONALIZE THE NUMERATOR. thanks 1 solutions Answer 300993 by edjones(7569)   on 2011-04-11 20:45:13 (Show Source): You can put this solution on YOUR website! (sqrt(5)-2)/(sqrt(5)+2) You must rationalize the DENOMINATOR always! Why? (sqrt(5)-2)/(sqrt(5)+2) * (sqrt(5)-2)/(sqrt(5)-2) =9-4sqrt(5)/1 =9-4sqrt(5) . Ed

testmodule/434438: the equation f a linear relation is: y=-3x+8 some ordered pair in the relation are: (-1,11),(0,8),(1, ),(2,2),( ,-1),(4, ) find the missing numbers in the ordered pairs 1 solutions Answer 300989 by edjones(7569)   on 2011-04-11 20:28:43 (Show Source): You can put this solution on YOUR website! (-1,11),(0,8),(1, ),(2,2),( ,-1),(4, ) This is a linear equation and x is changing by +1 while y is changing by -3 (-1,11),(0,8),(1,5),(2,2),(3,-1),(4,-4) . Ed .

Quadratic_Equations/434435: y2-4y-45=o I need help solving this my teacher went through it in class but i still don't get it please go through it step by step. Thank you :) 1 solutions Answer 300980 by edjones(7569)   on 2011-04-11 20:04:01 (Show Source): You can put this solution on YOUR website! y2-4y-45=0 (y-9)(y+5)=0 y=9, y=-5 . Ed

Numeric_Fractions/434437: 4/5 + 8/15 =? 1 solutions Answer 300978 by edjones(7569)   on 2011-04-11 20:02:25 (Show Source): You can put this solution on YOUR website! 4/5 + 8/15 = 12/15 + 8/15 = 20/15 = 4/3 . Ed

Linear-equations/434412: How Do You Solve Y=(7/4)x-4 1 solutions Answer 300975 by edjones(7569)   on 2011-04-11 20:00:11 (Show Source): You can put this solution on YOUR website! Do you wish to solve for y or x?

Linear-systems/434421: Im sorry but can you help me with the other question Angelo thinks that x^2=(x-y)^2 for all values of x and y. which pair of values disproves his theory? A x=2 and y=0 B x=1 and y=1 C x=0 and y=1 D x=0 and y=0 1 solutions Answer 300972 by edjones(7569)   on 2011-04-11 19:53:45 (Show Source): You can put this solution on YOUR website! B) 1^2=(1-1)^2 1=0 . C) 0^2=(0-1)^2 0=1 . Both are wrong. . Ed

Radicals/434423: Mr.Crespobakes cinnamonb uns at his restaurant. There are 30 buns in a batch. If he makes 12 batches, how many buns does he make in all 1 solutions Answer 300966 by edjones(7569)   on 2011-04-11 19:42:10 (Show Source): You can put this solution on YOUR website! 30*12=360

Miscellaneous_Word_Problems/434425: the sum of two numbers is 100. Their difference is 10. What is the value of the least number? 1 solutions Answer 300964 by edjones(7569)   on 2011-04-11 19:41:10 (Show Source): You can put this solution on YOUR website! x+y=100 x-y=10 --------add 2x=110 . x=55 y=45 . Ed

Quadratic_Equations/434414: PLEASE SOLVE EACH QUADRATIC EQUATION. 1. x^2+3x=-5 2. x^2-36=0 3. 2x^2-4x+10=0 1 solutions Answer 300962 by edjones(7569)   on 2011-04-11 19:37:33 (Show Source): You can put this solution on YOUR website! 2x^2-4x+10=0 x^2-2x+5=0 x^2-2x =-5 x^2-2x+1=-5+1 completing the square (x-1)^2=-4 x-1=+-sqrt(-4) x=1+-2i x=1+2i, x=1-2i . Ed

Angles/434409: angle b=43. find the measure of its complement 1 solutions Answer 300957 by edjones(7569)   on 2011-04-11 19:28:27 (Show Source): You can put this solution on YOUR website! 90-43=47 complement of angle b.

Rectangles/434399: Which value is NOT a solution to 5b-3>12? a.3 b.4 c.5 d.6 1 solutions Answer 300956 by edjones(7569)   on 2011-04-11 19:27:02 (Show Source): You can put this solution on YOUR website! 5b-3>12 5b>15 b>5 . a, b and c are not solutions. . Ed

Polynomials-and-rational-expressions/434386: Please help me solve this equation:(4x^2-7x+2)+(-x^2+x-2) 1 solutions Answer 300955 by edjones(7569)   on 2011-04-11 19:22:30 (Show Source): You can put this solution on YOUR website! (4x^2-7x+2)+(-x^2+x-2) This is not an equation. It doesn't have an equal sign with some other numbers on the other side of the equal sign. It is an expression which can be simplified: =4x^2-7x+2-x^2+x-2 =3x^2-6x simplified expression or 3x(x-2) factored expression. . Ed

Linear-equations/434388: What is the solution to the following three problems: 9x + 5 < 50 ..... -1/3y -7 <18.and. 4x + 5 < 7x - 4 1 solutions Answer 300950 by edjones(7569)   on 2011-04-11 19:09:25 (Show Source): You can put this solution on YOUR website! 9x + 5 < 50 9x<45 x<5 . Ed

Quadratic_Equations/434383: Solve each quadratic equation. 1. x^2+3x=-5 2. x^2-36=0 3. 2x^2-4x+10=0 1 solutions Answer 300949 by edjones(7569)   on 2011-04-11 19:07:58 (Show Source): You can put this solution on YOUR website! x^2-36=0 (x+6)(x-6)=0 x=6, x=-6 . Ed

Polynomials-and-rational-expressions/434374: 5x^2=80 1 solutions Answer 300946 by edjones(7569)   on 2011-04-11 19:06:24 (Show Source): You can put this solution on YOUR website! 5x^2=80 x^2=16 x=4, x=-4 . Ed

Permutations/434318: Determine the number of 5-digit zip codes (assume the digits can be repeated, but the first digit cannot be zero). 1 solutions Answer 300943 by edjones(7569)   on 2011-04-11 19:03:41 (Show Source): You can put this solution on YOUR website! 9*10^4=90,000