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# Recent problems solved by 'edjones'

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 Probability-and-statistics/453762: In the NASCAR racing industry ball bearings are automatically produced on a Kronar BBX machine and are known to be normally distributed. For one of the production lines, the mean diameter is set at 20.00 mm (millimeters). The standard deviation, over a long period of time, was computed to be 0.150 mm. What percent of the ball bearings on this line will have diameters of 20.27 mm or more?1 solutions Answer 311710 by edjones(7569)   on 2011-05-24 21:33:13 (Show Source): You can put this solution on YOUR website!20.27-20.00=0.27 z=0.27/0.150=1.8 3.593% . Ed
 Probability-and-statistics/453677: A box of Strawberries has a mean number of berries of 14 with st. dev. of 3. Find the probability of getting a box of Strawberries with more than 16 berries. 1 solutions Answer 311702 by edjones(7569)   on 2011-05-24 21:08:00 (Show Source): You can put this solution on YOUR website!For a normal distribution: z=(16-14)/3=2/3 .2525 . Ed
 Rate-of-work-word-problems/453679: if twenty -one men build a road in twenty days how man days seven men will take1 solutions Answer 311692 by edjones(7569)   on 2011-05-24 20:36:03 (Show Source): You can put this solution on YOUR website!21*20=420 man-days 420/7=60 days it will take 7 men. . Ed
 Distributive-associative-commutative-properties/453686: 3x+3=5+8x1 solutions Answer 311690 by edjones(7569)   on 2011-05-24 20:30:24 (Show Source): You can put this solution on YOUR website!3x+3=5+8x -5x=2 x=-2/5 . Ed
 Equations/453708: Can someone help me simplify this problem? ∛2161 solutions Answer 311687 by edjones(7569)   on 2011-05-24 20:25:45 (Show Source): You can put this solution on YOUR website!∛216=6
 Equations/453560: I dont understand how to plug it into the formula, please help. A basketball was thrown from one end of a court to the other. It had an initial upward velocity of 48 feet per second. How long did it take for the ball to hit the ground? Use the formula h = vt – 16t2.1 solutions Answer 311642 by edjones(7569)   on 2011-05-24 16:12:01 (Show Source): You can put this solution on YOUR website!v=velocity=48, h=height=0, t=time h = vt – 16t^2 48t-16t^2=0 16t(3-t)=0 -t=-3 t=3 sec . Ed
 Travel_Word_Problems/453549: How long will it take to drive 963 miles going 65 mph1 solutions Answer 311640 by edjones(7569)   on 2011-05-24 16:01:16 (Show Source): You can put this solution on YOUR website!963/65=14.81 hrs
 Miscellaneous_Word_Problems/453566: if a coin is tossed 11 times, haw many different sequences from tails and heads are possible?1 solutions Answer 311638 by edjones(7569)   on 2011-05-24 15:58:30 (Show Source): You can put this solution on YOUR website!2^11=2048
 Probability-and-statistics/453567: A couple has 7 children. What is the probability of having exactly 2 boys?1 solutions Answer 311635 by edjones(7569)   on 2011-05-24 15:54:18 (Show Source): You can put this solution on YOUR website!Assume an equal likelihood of having a girl or a boy. g=.5, b=.5 (g+b)^7 nCr=7C2=21 21g^5b^2 =.1641 the probability of having exactly 2 boys. . Ed
 Linear-equations/453573: write an equation in slope-intercept form with a slope of 3/7 and a y-intercept of 41 solutions Answer 311634 by edjones(7569)   on 2011-05-24 15:47:33 (Show Source): You can put this solution on YOUR website!y = 3x/7 + 4
 Geometry_Word_Problems/453568: A survey of flower gardeners showed the following: 45 grew roses 7 grew both roses and tulips 4 grew all three types 16 grew tulips 5 grew both orchids and tulips 9 grew none of these three 13 grew orchids 10 grew both roses and orchids (a) How many grew only roses? (b) How many grew both roses and tulips, but not orchids? (c) How many grew only tulips? (d) How many grew none of these three or only orchids? (e) How many flower gardeners were surveyed?1 solutions Answer 311633 by edjones(7569)   on 2011-05-24 15:45:37 (Show Source): You can put this solution on YOUR website!Make a 3 circle Venn diagram to understand this. a)32 b)3 c)8 d)11 e)65 . Ed
 Linear-systems/453569: The sum of 2 numbers is 26 and the difference is 10. Help me how to solve the Linear Equations, please.1 solutions Answer 311628 by edjones(7569)   on 2011-05-24 15:36:08 (Show Source): You can put this solution on YOUR website!x+y=26 x-y=10 -------add 2x=36 . x=18 y=8 . Ed
 Linear-systems/453557: I'm trying to solve this system of equations by graphing: 5x+ y=32 6x+ 7=-8 What is the ordered pair?1 solutions Answer 311627 by edjones(7569)   on 2011-05-24 15:34:10 (Show Source): You can put this solution on YOUR website!It's a dot on the graph. 5x + y=32 If x=0 then y=32 and the ordered pair is (0, 32) if x=1 then y=27 and the ordered pair is (1, 27) if x=-1 then y=37 and the ordered pair is (-1, 37) Connect the dots on graph paper and you have a straight line. Do the same to the 2nd equation (you didn't put in a y after the 7) and draw a line the ordered pair where the lines cross is the answer to the system of equations. . Ed
 Pythagorean-theorem/453561: Simplify. Assume that no denominator is equal to zero. 4. (a squared b to the 4power )(a cubed b to the 5power) 1 solutions Answer 311625 by edjones(7569)   on 2011-05-24 15:22:18 (Show Source): You can put this solution on YOUR website!(a^2b^4)(a^3b^5) =a^5b^9
 Probability-and-statistics/453558: A container contains 34 red marbles and 4 green marbles. 4 different marbles are randomly selected from the container.the probability that all of them are red (rounded to three decimal places) equals.1 solutions Answer 311624 by edjones(7569)   on 2011-05-24 15:18:54 (Show Source): You can put this solution on YOUR website!nCr=combination of n things taken r at a time.=n!/((n-r)!*r!) 34C4/38C4 =46376/73815 =.628 . Ed
 Probability-and-statistics/453552: Suppose each of the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 is written on a separate poker chip and placed in a hat. If one of the chips is randomly selected, determine the probability that the chip selected will contain an odd number or a number less than five.1 solutions Answer 311621 by edjones(7569)   on 2011-05-24 15:12:25 (Show Source): You can put this solution on YOUR website!There are 4 numbers less than five and 3 odd numbers not already counted. 4+3=7 7/10 the probability that the chip selected will contain an odd number or a number less than five. . Ed
 Exponents-negative-and-fractional/453553: how do you write 1/5 using a negative exponent? 1 solutions Answer 311617 by edjones(7569)   on 2011-05-24 15:08:47 (Show Source): You can put this solution on YOUR website!5^-1
 Length-and-distance/453439: A and B are cycling along the circular boundary of a playground. If they start toward each other from the opposite end of the diameter 150 m long with A riding at twice the speed of B, then find the distance traveled by B when two meet.1 solutions Answer 311616 by edjones(7569)   on 2011-05-24 15:07:09 (Show Source): You can put this solution on YOUR website!C=pi*d =150pi m 150pi/2=75pi m. combined distance they travel. b=b's speed 2b=a's speed 3b=their combined speed 75pi/3=25pi m. distance traveled by b. . Ed
 Graphs/453449: So;lve each inequality 1.) -61 > b-31 2.) FiFteen is greater than a number minus 7. 3. A number plus 11 is less than of equal to 9. Solve each problem by either drawing a diagram or writing an equation. Ezplain why you chose the method you did. 1. There are 45 students with in Jasons class. One-ninth of the students have hazel eyes. How many students have hazel eyes? 2. Alice is making casserole snacks. Each snack will be 2 inches by 4 inches. How many snacks will she have if she bakes 4 batches, each in a 12-inch by 16-inch baking pan? Choose a strategy to solve each problem. 3. Suppose you buy a basketball at a garage sale for \$3.You then sell the ball to a friend for \$4.25.You buy the ball back for \$4.75, and then sell the ball for \$5. How much money do you make? 4. Derek gave Kyle half of his marble collection. Kyle gave Janis half of the marbles he received from Derek. Janis kept 12 of the marbles and gave the remaining 16 to Jill. How many marbles did Derek give to Kyle? 5. Use a calculator or a table of square roots to find each square root to the nearest tenth. a. 43 b. 71 c. 56 d. 167 e. 214 f. 1,421 tELL WHEATHER EACH NUMBER IS RATIONAL. 18 3/8 6.8311 solutions Answer 311610 by edjones(7569)   on 2011-05-24 14:50:34 (Show Source): You can put this solution on YOUR website!1.) -61 > b-31 -b>30 b<-30 . Ed
 Equations/453455: 5t+17=27+8t1 solutions Answer 311608 by edjones(7569)   on 2011-05-24 14:47:36 (Show Source): You can put this solution on YOUR website!5t+17=27+8t -3t=10 subtract 8t+17 from each side. t= -10/3 divide each side by -3 . Ed
 Travel_Word_Problems/453461: beaumont texas is about 150 miles from toledo bend. if jerry leaves beaumont at 4am and averages 53mph what time shouldhe arrive at toledo bend?1 solutions Answer 311607 by edjones(7569)   on 2011-05-24 14:44:13 (Show Source): You can put this solution on YOUR website!150/53=2.83 .83*60~50 6:50 AM . Ed
 Radicals/453464: could you help me with the following - simplify sqrt(5)*sqrt(30) x/sqrt(5) 3sqrt(50)-2sqrt(72) + sqrt(24)1 solutions Answer 311605 by edjones(7569)   on 2011-05-24 14:40:49 (Show Source): You can put this solution on YOUR website!sqrt(5)*sqrt(30) =sqrt(150) =sqrt(25*6) =5sqrt(6) . Ed
 test/453488: A random selection of files from a student counseling center revealed the following reasons why college students seek services: Mental health issues 25 Learning/school issues 15 Relationship issues 5 Other 5 1 solutions Answer 311603 by edjones(7569)   on 2011-05-24 14:37:30 (Show Source): You can put this solution on YOUR website!What's the question?
 test/453525: 1. (3x^2-2x+10)-(3x^2+3x+1)= 2. (y-y^2)-(2y-2y^2)-(3+y)= 3. (2w^3-3w^2+4)-(-2w^2+7w+1)= 4. (-x^7+10x+7)-(9x^7-4x-1)= 5. (x^4+3x^3-2x-19)-(-x^5+4x^4-3x-3)= 6. (2x^2+9x+1)-(x^2+4)= 7.(2a^3-3a^2+a)-(2a^3-3a^2+a+1)= 9.(11s-1)(11s+1)= 10.(8q+3pq)(8q-3pq)= 11.(mn+5n^2)(-5n^2+mn)= 12.(4xyz-2xy)(4xyz+2xy)= 13.(x-y)(x+y)(x^2+y^2)= 14.(4a-3b)(4a+3b)= 15.(kx+5)(kx-5)= 16.(2a^3-b^2)(2a^3+b^2)= 17.(3a+5x)(3a-5x)= 18.(mn-m^2)(-n+m)= 19.(-5k+3b)(b+2k)= 20.(-5k-3b)(-b-2k)= 21.(-2a+3b)(a^2b+b^2a)=1 solutions Answer 311600 by edjones(7569)   on 2011-05-24 14:34:18 (Show Source): You can put this solution on YOUR website!17.(3a+5x)(3a-5x) =9a^2-25x^2
 Probability-and-statistics/453425: In a certain microwave oven on the high power setting, the time it takes a randomly chosen kernel of popcorn to pop is normally distributed with a mean of 140 seconds and a standard deviation of 25 seconds. (1) What percentage of the kernels will fail to pop if the popcorn is cooked for (Round your answers to 4 decimal places. Omit the "%" sign in your response.) (a) Two minutes % (b) Three minutes % (2) Determine the time that would be allowed in order to get the following percentage of the kernels popped. (Round your answers to 3 decimal places.) (c) 95 percent seconds (d) 99 percent seconds 1 solutions Answer 311568 by edjones(7569)   on 2011-05-24 12:43:44 (Show Source): You can put this solution on YOUR website!1a) 120-140=-20 -20/25=-.8 .7881 . 1b) 180-140=40 40/25=1.6 .0548 . Ed
 Probability-and-statistics/453424: The length of a Colorado brook trout is normally distributed. (a) What is the probability that a brook trout's length exceeds the mean? (Round your answer to 2 decimal places.) Probability (b) What is the probability that a brook trout's length exceeds the mean by at least 1 standard deviation? (Round your answer to 4 decimal places.) Probability (c) What is the probability that a brook trout's length exceeds the mean by at least 2 standard deviations? (Round your answer to 4 decimal places.) 1 solutions Answer 311563 by edjones(7569)   on 2011-05-24 12:26:54 (Show Source): You can put this solution on YOUR website!a)0.50 . b)0.1587 . c) 0.0227 . Ed
 Probability-and-statistics/453426: The time it takes to give a man a shampoo and haircut is normally distributed with mean 22 minutes and standard deviation 3 minutes. Customers are scheduled every 30 minutes. (a) What is the probability that a male customer will take longer than the allotted time? (Round your answer to 4 decimal places.) Probability (b) If three male customers are scheduled sequentially on the half-hour, what is the probability that all three will be finished within their allotted half-hour times? (Round your answer to 4 decimal places.)1 solutions Answer 311559 by edjones(7569)   on 2011-05-24 12:11:20 (Show Source): You can put this solution on YOUR website!a) z=(30-22)/3=2.6667 .0038 probability that a male customer will take longer than the allotted time . b) 1-.0038=.9962 .9962^3=.9886 the probability that all three will be finished within their allotted half-hour times. . Ed
 Radicals/453462: Could you please help me with the following problems √5 ∙ √30 x/√51 solutions Answer 311556 by edjones(7569)   on 2011-05-24 11:56:36 (Show Source): You can put this solution on YOUR website!x/sqrt(5) * sqrt(5)/sqrt(5) rationalize the denominator =x*sqrt(5)/5 . Ed
 Probability-and-statistics/453465: a set of data has a normal distribution with a mean of 5.1 and a standard deviation of 0.9 find the percent of data between 4.2 and 5.1 1 solutions Answer 311555 by edjones(7569)   on 2011-05-24 11:52:37 (Show Source): You can put this solution on YOUR website!z=(4.2-5.1)/0.9=-1 Area underneath the curve between -1 and 0 is .341345 answer: 34.13% . Ed
 Polynomials-and-rational-expressions/452136: Solve 2*15^2 (5+8)^31 solutions Answer 310906 by edjones(7569)   on 2011-05-21 01:11:47 (Show Source): You can put this solution on YOUR website!2*15^2 =2*225 do exponents before times =450 . (5+8)^3 do parentheses before exponents =13^3 =2197 . Ed
 Permutations/452129: Hi. A quiz has five true-false questions and 3 multiple choice questions with 4 options each. How many possible ways are there to answer the 8 questions.. Ive already decided that you should use permutations on this because order does matter, correct? 1 solutions Answer 310905 by edjones(7569)   on 2011-05-21 01:06:59 (Show Source): You can put this solution on YOUR website!Incorrect. Order doesn't matter. There are 2 possible ways to answer the t/f questions and 4 possible ways for the multiple choice. 2^5 * 4^3 =32*64 =2048 possible ways. . Ed